I figured I'd turn my amazon wish list into a post for here 
They're sorted by zoo, then author. I've only included books that are specifically about individual zoos. There are others you can find that are about the parks that zoos are in where they maybe get a chapter, books that are primarily about wildlife but mention zoos, etc, but I haven't included those. I also haven't included books meant for children, or ones that aren't in English.
Brookfield Zoo
-Let the Lions Roar!: The Evolution of Brookfield Zoo, Andrea Ross. Chicago Zoological Society, 1997. 273 page, hc. A history of the zoo, published by the zoo itself.
-Brookfield Zoo & the Chicago Zoological Society (Images of America), Douglas Deuchler. Arcadia, 2009. 128 pages, pb. A history of the zoo.
Busch Gardens Tampa Bay
-Busch Gardens Tampa Bay (Images of Modern America), Joshua McMorrow-Hernandez. Arcadia, 2017. 96 pages, pb. A history of the zoo and theme park.
Cincinnati Zoo
-The Cincinnati Zoo and Botanical Garden: From Past to Present, David Ehrlinger. Cincinnati Zoo & Botanical Garden, 1993. 141 pages, hc. A history of the zoo.
-The Cincinnati Zoo and Botanical Garden (Images of America), Joy W. Kraft. Arcadia, 2010. 128 pages, pb. A history of the zoo. "… the venture by bird-lover Andrew Erkenbrecher and friends blossomed into a top-tier zoo inspiring a passion for nature-a champion of endangered species with its own college-preparatory high school and an unrivaled commitment to education, research, and innovative breeding programs."
Cleveland Zoo
-My Life in the Cleveland Zoo: A Memoir, Adam A. Smith. Drinian Press, 2014. 418 pages, pb. The story of Smith's life at the zoo, from a summer job as a tour train driver in his teens to night watchman after college and eventually an elephant keeper.
Columbus Zoo
-Gorillas in our Mist: The Story of the Columbus Zoo Gorillas, Jeff Lyttle. Ohio State University Press, 2016. 214 pages, pb. "... chronicles the characters and events ... From the brutal capture of the zoo's first gorillas in the rain forests of Africa to the birth and mother-rearing of a fourth generation of offspring, author Jeff Lyttle takes the reader through the triumphs and tragedies of a captive gorilla program that is on the leading edge of the effort to preserve the endangered western lowland gorilla."
DeYoung Family Zoo
-It’s a Wild Life: How My Life Became a Zoo, Bud DeYoung. Medallion Press, 2014. 256 pages, hc. "Welcome to the fascinating, heartwarming journey of one man, one woman, and an amazing cast of critters, whose stories will warm your soul."
Elmwood Park Zoo
-Elmwood Park Zoo (Images of Modern America), Stan Huskey. Arcadia, 2016. 96 pages, pb. A history of the zoo. "Although the early years of the zoo were more akin to a small farm, it has gone through an extensive expansion during the past few decades. ... The zoo today, with new features including a zip line and a giraffe exhibit, looks to the future, with plans for even more exhibits, a new restaurant, and an additional 20 acres yet to be developed."
Knoxville Zoo
-Knoxville Zoo, TN (Images of America), Sonya A. Haskins. Arcadia, 2007. 128 pages, pb. "This book celebrates the zoo’s fascinating history with approximately 200 black-and-white images and detailed captions of its birth, rebirth, and journey toward becoming one of the nation’s premier zoological institutions."
Lincoln Park Zoo
-The Ark in the Park: The Story of Lincoln Park Zoo, Mark Rosenthal. University of Illinois Press, 2003. 216 pages, pb. "Looks at the development of Chicago's Lincoln Park Zoo, from its beginning in 1868 to the present day."
Memphis Zoo
-Memphis Zoo (Images of America), Robert W. Dye. Arcadia, 2015. 128 pages, pb. A history of the zoo.
Mesker Park Zoo
-A Pictorial History of Mesker Park Zoo, Evansville Zoological Society. M.T. Publishing, 2011. 208 pages, library binding. "...through a brief history complemented by hundreds of never before published photos from both the Willard Library archives and the zoo archives."
Milwaukee County Zoo
-Milwaukee County Zoo (Images of America), Darlene Winter. Arcadia, 2014. 128 pages, pb. A history of the zoo.
New York City Zoological Society
-Confessions of an Accidental Zoo Curator, Annette Berkovits. Tenth Planet Press, 2017. 338 pages, pb. "the inside scoop… was born in Kyrgyzstan and grew up in postwar Poland before coming to America at age sixteen. In her three-decade career with the Wildlife Conservation Society in New York, she spearheaded the institution’s nationwide and worldwide science education programs."
-You Belong in a Zoo! Tales From a Lifetime Spent With Cobras, Crocs, and Other Creatures, Peter Brazaitis. Villard, 2003. 368 pages, hc. Peter went straight from high school to a job at the reptile house at the Bronx Zoo, where he stayed for 30 years before becoming curator at the Central Park Zoo.
-New York City Zoos and Aquarium (Images of America), Joan Scheier. Arcadia, 2006. 128 pages, pb. A history of the 5 zoos and 1 aquarium within NYC, along with some children's zoos that have existed.
New York City Zoological Society: Bronx Zoo
- Gathering of Animals: An unconventional history of the New York Zoological Society, William Bridges. Harper & Row, 1974. 518 pages, hc. A history of the Bronx Zoo and the people who founded it.
-Wild Lives: A History of People & Animals of the Bronx Zoo, Kathleen Zoehfeld. Knopf Books for Young Children, 2006. 96 pages, hc. "Wild Lives takes readers through a century of zookeeping at one of the most-beloved zoos in the world, and shares what zoologists have learned over the years about keeping wild animals."
New York City Zoological Society: Central Park Zoo
-Central Park Zoo (NY) (Images of America), Joan Scheier. Arcadia, 2002. 128 pages, pb. A history of the zoo and its predecessors.
Oklahoma City Zoo
-Oklahoma City Zoo 1902-1959 (Images of America), Amy Dee Stephens. Arcadia, 2006. 128 pages, pb. A history of the zoo's first 57 years.
-Oklahoma City Zoo 1960-2013 (Images of America), Amy Dee Stephens. Arcadia, 2014. 128 pages, pb. The second half of the zoo's history.
Omaha’s Henry Doorly Zoo
-Doc: Zoo Memories and Animal Stories, Lee G. Simmons. Legacy Preservation, 2018. 371 pages, hc. "Doc takes readers through an exciting, decades-long journey of animal care across 51 countries and Antarctica. Sharing stories in an easy-to-read manner... In addition to zoo and animal stories, Doc includes Simmons’ thoughts on zoo and aquarium design, a listing of Omaha zoo exhibits and expansions that he partook in, and his curriculum vitae, which lists his published academic papers."
-Omaha’s Henry Doorly Zoo & Aquarium, Eileen Wirth. Landmarks, 2017. 160 pages, pb. A history of the zoo, as well as its conservation programs.
Oregon Zoo
-Elephant House, Dick Blau. Penn State University Press, 2015. 108 pages, hc. "...a thought-provoking study of the Oregon Zoo’s Asian Elephant Building and the daily routines of its residents..."
Phoenix Zoo
-Phoenix Zoo (Images of America), Debbie Veldhuis. Arcadia, 2018. 128 pages, pb. A history of the zoo.
Reptileland
-Reptileland: How a Boyhood Dream Became a Modern Zoo, Clyde Peeling. Peeling Productions, 2014. 148 pages, pb. "This book chronicles the ambitious journey behind establishing one of the country's leading specialized zoos. … The book also records philosophical changes in the function and purposes of zoos over the last half-century. "
Riverbanks Zoo
-Riverbanks Zoo & Garden: Forty Wild Years, Palmer Krantz. University of South Carolina Press, 2014. 224 pages, pb. "Much like the zoo itself, this book features extraordinary animals, dynamic natural habitats, and significant historic landmarks. Riverbanks's rich history is captured here through anecdotal stories and nearly two hundred brilliant photographs and illustrations, making it easy to see why Riverbanks is recognized as one of the nation's great zoological parks and botanical gardens."
Saint Louis Zoo
-Animals Always: 100 Years at the Saint Louis Zoo, Mary Delach Leonard. University of Missouri Press, 2009. 208 pages, hc. "Overflowing with stories, photographs, and fascinating sidebars, this captivating volume covers the Zoo’s rich history and its emergence as a modern-day center of research and conservation."
San Diego Zoo
-Mister Zoo: The Life & Legacy of Dr. Charles Schroeder, Douglas Myers. Zoological Society of San Diego, 2015. 400 pages, hc. "Beginning with some of Charles Schroeder's boyhood experiences, the book chronicles his veterinary studies, his work as a San Diego Zoo veterinarian, and his Zoo directorship through stories, anecdotes, and reminiscences from those who know him best. A great opportunity to learn some of the early history of the World-Famous San Diego Zoo and San Diego Wild Animal Park, and to get to know a Zoo legend.”
-The San Diego Zoo: The First Century (2 book box set), Lynda Stephenson. Zoological Society of San Diego, 2015. 400 pages, hc. Book 1: The Founding Era 1916-1953. Book 2: The Modern Era 1954-2016. " Illustrated with 500+ timeless photos, the history preserved in The San Diego Zoo: The First Century the whimsical, the colorful, the audacious, the heart-tugging, the groundbreaking, and the visionary is destined to be treasured by Zoo lovers for generations to come. Two coffee-table size volumes with dust jackets in slipcase..."
San Francisco Zoo
-San Francisco Zoo (Images of America), Katherine Girlich. Arcadia, 2009. 128 pages, pb. "This book celebrates the San Francisco Zoo's 80-year history as it revisits cherished animals and structures like Monkey Island, Storyland, and Dentzel Carousel.”
-San Francisco Zoo (Postcards of America), Katherine Girlich. Arcadia, 2009. 15 pages, cardstock. 15 postcards of images from the zoo's past.
Smithsonian National Zoo
-Raising America’s Zoo: How 2 Gorillas Helped Transform the National Zoo, Kara Arundel. Mascot Books, 2017. 224 pages, hc. "...shares the heartbreak and triumphs of these first-generation zoo gorillas and their caregivers who worked tirelessly to make their lives better. Witness the personal story of Nick Arundel, a man who at first celebrated their capture, then grew to regret his tale of hunting gorillas... Experience the National Zoo's voyage of contentious responsibility, limited capacity, joyful discoveries, and urgent deadlines to preserve western lowland gorillas."
Turtle Back Zoo
-Turtle Back Zoo (Images of America), Brint Spencer. Arcadia, 2014. 128 pages, pb. A history of the zoo, from its founding as a seasonal children's zoo through its renovation and transition into a first-rate, modern zoo.
Woodland Park Zoo
-Woodland: The Story of the Animals and People of Woodland Park Zoo, John Bierlein. History Ink, 2017. 200 pages, pb. "A history and exploration of the challenges, innovations, lore and controversies surrounding Seattle's zoo… full of photography."
ZooNebraska
-Zoo Nebraska: The Dismantling of an American Dream, Carson Vaughan. Little A Publishing, March 2019. Hc. The story of Zoo Nebraska, a 7-acre zoo in a tiny town that started as a primate center and eventually closed. "A resonant true story of small-town politics and community perseverance and of decent people and questionable choices."
ZooTampa at Lowry Park
-Zoo Story: Life in the Garden of Captives, Thomas French. Hachette Books, 2005. 304 pages, hc/pb. " Based on six years of research, the book follows a handful of unforgettable characters at Tampa's Lowry Park Zoo…"
They're sorted by zoo, then author. I've only included books that are specifically about individual zoos. There are others you can find that are about the parks that zoos are in where they maybe get a chapter, books that are primarily about wildlife but mention zoos, etc, but I haven't included those. I also haven't included books meant for children, or ones that aren't in English.Brookfield Zoo
-Let the Lions Roar!: The Evolution of Brookfield Zoo, Andrea Ross. Chicago Zoological Society, 1997. 273 page, hc. A history of the zoo, published by the zoo itself.
-Brookfield Zoo & the Chicago Zoological Society (Images of America), Douglas Deuchler. Arcadia, 2009. 128 pages, pb. A history of the zoo.
Busch Gardens Tampa Bay
-Busch Gardens Tampa Bay (Images of Modern America), Joshua McMorrow-Hernandez. Arcadia, 2017. 96 pages, pb. A history of the zoo and theme park.
Cincinnati Zoo
-The Cincinnati Zoo and Botanical Garden: From Past to Present, David Ehrlinger. Cincinnati Zoo & Botanical Garden, 1993. 141 pages, hc. A history of the zoo.
-The Cincinnati Zoo and Botanical Garden (Images of America), Joy W. Kraft. Arcadia, 2010. 128 pages, pb. A history of the zoo. "… the venture by bird-lover Andrew Erkenbrecher and friends blossomed into a top-tier zoo inspiring a passion for nature-a champion of endangered species with its own college-preparatory high school and an unrivaled commitment to education, research, and innovative breeding programs."
Cleveland Zoo
-My Life in the Cleveland Zoo: A Memoir, Adam A. Smith. Drinian Press, 2014. 418 pages, pb. The story of Smith's life at the zoo, from a summer job as a tour train driver in his teens to night watchman after college and eventually an elephant keeper.
Columbus Zoo
-Gorillas in our Mist: The Story of the Columbus Zoo Gorillas, Jeff Lyttle. Ohio State University Press, 2016. 214 pages, pb. "... chronicles the characters and events ... From the brutal capture of the zoo's first gorillas in the rain forests of Africa to the birth and mother-rearing of a fourth generation of offspring, author Jeff Lyttle takes the reader through the triumphs and tragedies of a captive gorilla program that is on the leading edge of the effort to preserve the endangered western lowland gorilla."
DeYoung Family Zoo
-It’s a Wild Life: How My Life Became a Zoo, Bud DeYoung. Medallion Press, 2014. 256 pages, hc. "Welcome to the fascinating, heartwarming journey of one man, one woman, and an amazing cast of critters, whose stories will warm your soul."
Elmwood Park Zoo
-Elmwood Park Zoo (Images of Modern America), Stan Huskey. Arcadia, 2016. 96 pages, pb. A history of the zoo. "Although the early years of the zoo were more akin to a small farm, it has gone through an extensive expansion during the past few decades. ... The zoo today, with new features including a zip line and a giraffe exhibit, looks to the future, with plans for even more exhibits, a new restaurant, and an additional 20 acres yet to be developed."
Knoxville Zoo
-Knoxville Zoo, TN (Images of America), Sonya A. Haskins. Arcadia, 2007. 128 pages, pb. "This book celebrates the zoo’s fascinating history with approximately 200 black-and-white images and detailed captions of its birth, rebirth, and journey toward becoming one of the nation’s premier zoological institutions."
Lincoln Park Zoo
-The Ark in the Park: The Story of Lincoln Park Zoo, Mark Rosenthal. University of Illinois Press, 2003. 216 pages, pb. "Looks at the development of Chicago's Lincoln Park Zoo, from its beginning in 1868 to the present day."
Memphis Zoo
-Memphis Zoo (Images of America), Robert W. Dye. Arcadia, 2015. 128 pages, pb. A history of the zoo.
Mesker Park Zoo
-A Pictorial History of Mesker Park Zoo, Evansville Zoological Society. M.T. Publishing, 2011. 208 pages, library binding. "...through a brief history complemented by hundreds of never before published photos from both the Willard Library archives and the zoo archives."
Milwaukee County Zoo
-Milwaukee County Zoo (Images of America), Darlene Winter. Arcadia, 2014. 128 pages, pb. A history of the zoo.
New York City Zoological Society
-Confessions of an Accidental Zoo Curator, Annette Berkovits. Tenth Planet Press, 2017. 338 pages, pb. "the inside scoop… was born in Kyrgyzstan and grew up in postwar Poland before coming to America at age sixteen. In her three-decade career with the Wildlife Conservation Society in New York, she spearheaded the institution’s nationwide and worldwide science education programs."
-You Belong in a Zoo! Tales From a Lifetime Spent With Cobras, Crocs, and Other Creatures, Peter Brazaitis. Villard, 2003. 368 pages, hc. Peter went straight from high school to a job at the reptile house at the Bronx Zoo, where he stayed for 30 years before becoming curator at the Central Park Zoo.
-New York City Zoos and Aquarium (Images of America), Joan Scheier. Arcadia, 2006. 128 pages, pb. A history of the 5 zoos and 1 aquarium within NYC, along with some children's zoos that have existed.
New York City Zoological Society: Bronx Zoo
- Gathering of Animals: An unconventional history of the New York Zoological Society, William Bridges. Harper & Row, 1974. 518 pages, hc. A history of the Bronx Zoo and the people who founded it.
-Wild Lives: A History of People & Animals of the Bronx Zoo, Kathleen Zoehfeld. Knopf Books for Young Children, 2006. 96 pages, hc. "Wild Lives takes readers through a century of zookeeping at one of the most-beloved zoos in the world, and shares what zoologists have learned over the years about keeping wild animals."
New York City Zoological Society: Central Park Zoo
-Central Park Zoo (NY) (Images of America), Joan Scheier. Arcadia, 2002. 128 pages, pb. A history of the zoo and its predecessors.
Oklahoma City Zoo
-Oklahoma City Zoo 1902-1959 (Images of America), Amy Dee Stephens. Arcadia, 2006. 128 pages, pb. A history of the zoo's first 57 years.
-Oklahoma City Zoo 1960-2013 (Images of America), Amy Dee Stephens. Arcadia, 2014. 128 pages, pb. The second half of the zoo's history.
Omaha’s Henry Doorly Zoo
-Doc: Zoo Memories and Animal Stories, Lee G. Simmons. Legacy Preservation, 2018. 371 pages, hc. "Doc takes readers through an exciting, decades-long journey of animal care across 51 countries and Antarctica. Sharing stories in an easy-to-read manner... In addition to zoo and animal stories, Doc includes Simmons’ thoughts on zoo and aquarium design, a listing of Omaha zoo exhibits and expansions that he partook in, and his curriculum vitae, which lists his published academic papers."
-Omaha’s Henry Doorly Zoo & Aquarium, Eileen Wirth. Landmarks, 2017. 160 pages, pb. A history of the zoo, as well as its conservation programs.
Oregon Zoo
-Elephant House, Dick Blau. Penn State University Press, 2015. 108 pages, hc. "...a thought-provoking study of the Oregon Zoo’s Asian Elephant Building and the daily routines of its residents..."
Phoenix Zoo
-Phoenix Zoo (Images of America), Debbie Veldhuis. Arcadia, 2018. 128 pages, pb. A history of the zoo.
Reptileland
-Reptileland: How a Boyhood Dream Became a Modern Zoo, Clyde Peeling. Peeling Productions, 2014. 148 pages, pb. "This book chronicles the ambitious journey behind establishing one of the country's leading specialized zoos. … The book also records philosophical changes in the function and purposes of zoos over the last half-century. "
Riverbanks Zoo
-Riverbanks Zoo & Garden: Forty Wild Years, Palmer Krantz. University of South Carolina Press, 2014. 224 pages, pb. "Much like the zoo itself, this book features extraordinary animals, dynamic natural habitats, and significant historic landmarks. Riverbanks's rich history is captured here through anecdotal stories and nearly two hundred brilliant photographs and illustrations, making it easy to see why Riverbanks is recognized as one of the nation's great zoological parks and botanical gardens."
Saint Louis Zoo
-Animals Always: 100 Years at the Saint Louis Zoo, Mary Delach Leonard. University of Missouri Press, 2009. 208 pages, hc. "Overflowing with stories, photographs, and fascinating sidebars, this captivating volume covers the Zoo’s rich history and its emergence as a modern-day center of research and conservation."
San Diego Zoo
-Mister Zoo: The Life & Legacy of Dr. Charles Schroeder, Douglas Myers. Zoological Society of San Diego, 2015. 400 pages, hc. "Beginning with some of Charles Schroeder's boyhood experiences, the book chronicles his veterinary studies, his work as a San Diego Zoo veterinarian, and his Zoo directorship through stories, anecdotes, and reminiscences from those who know him best. A great opportunity to learn some of the early history of the World-Famous San Diego Zoo and San Diego Wild Animal Park, and to get to know a Zoo legend.”
-The San Diego Zoo: The First Century (2 book box set), Lynda Stephenson. Zoological Society of San Diego, 2015. 400 pages, hc. Book 1: The Founding Era 1916-1953. Book 2: The Modern Era 1954-2016. " Illustrated with 500+ timeless photos, the history preserved in The San Diego Zoo: The First Century the whimsical, the colorful, the audacious, the heart-tugging, the groundbreaking, and the visionary is destined to be treasured by Zoo lovers for generations to come. Two coffee-table size volumes with dust jackets in slipcase..."
San Francisco Zoo
-San Francisco Zoo (Images of America), Katherine Girlich. Arcadia, 2009. 128 pages, pb. "This book celebrates the San Francisco Zoo's 80-year history as it revisits cherished animals and structures like Monkey Island, Storyland, and Dentzel Carousel.”
-San Francisco Zoo (Postcards of America), Katherine Girlich. Arcadia, 2009. 15 pages, cardstock. 15 postcards of images from the zoo's past.
Smithsonian National Zoo
-Raising America’s Zoo: How 2 Gorillas Helped Transform the National Zoo, Kara Arundel. Mascot Books, 2017. 224 pages, hc. "...shares the heartbreak and triumphs of these first-generation zoo gorillas and their caregivers who worked tirelessly to make their lives better. Witness the personal story of Nick Arundel, a man who at first celebrated their capture, then grew to regret his tale of hunting gorillas... Experience the National Zoo's voyage of contentious responsibility, limited capacity, joyful discoveries, and urgent deadlines to preserve western lowland gorillas."
Turtle Back Zoo
-Turtle Back Zoo (Images of America), Brint Spencer. Arcadia, 2014. 128 pages, pb. A history of the zoo, from its founding as a seasonal children's zoo through its renovation and transition into a first-rate, modern zoo.
Woodland Park Zoo
-Woodland: The Story of the Animals and People of Woodland Park Zoo, John Bierlein. History Ink, 2017. 200 pages, pb. "A history and exploration of the challenges, innovations, lore and controversies surrounding Seattle's zoo… full of photography."
ZooNebraska
-Zoo Nebraska: The Dismantling of an American Dream, Carson Vaughan. Little A Publishing, March 2019. Hc. The story of Zoo Nebraska, a 7-acre zoo in a tiny town that started as a primate center and eventually closed. "A resonant true story of small-town politics and community perseverance and of decent people and questionable choices."
ZooTampa at Lowry Park
-Zoo Story: Life in the Garden of Captives, Thomas French. Hachette Books, 2005. 304 pages, hc/pb. " Based on six years of research, the book follows a handful of unforgettable characters at Tampa's Lowry Park Zoo…"
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