Volume 14 (Trade & Transport of Animals), having been published in 1974, is a bit out-of-date as regards the regulations world wide for trade of animals, as CITES was only being proposed at that stage.
The section on transportation deals with such diverse species as flamingoes, dolphins, manatees and african ungulates, and is still quite relevant.
Volume 20 (Breeding Endangered Species) was published in 1980 and proposed ideas which are accepted procedure today but were quite revolutionary back then, such as warnings about inbreeding, and also the need for zoos to co-operate in regional breeding plans.
A break-through article titled "Tomorrow's Ark: By Invitation Only" put forward the (then) revolutionary idea that zoos would not be able to be "stamp collections" of animals and that fewer species with more individuals per species would be the way to go.
Articles on captive reproduction dealt with pigmy chimps, lion tailed macaques, douroucoulis, sea otters, duikers, rare ibis and various Madagascan animals.