Reptile 1517 is very knowledgeable; Sooty Mangabey and Paradoxurus know a lot too.
It is likely that the same guide book was reprinted several times. The introduction to the one the map comes from makes reference to visitor numbers 'By September 1955', so it is obviously later than that but may be the same in all other respects to the 1950 one. It was renamed 'Rainbow's End in about 1984, not long after the bears escaped and presumably when the animals were replaced with rides. I am not sure when the name changed from Pets' Corner to Zootopia but 1978 might be about right and co-incided with a change of ownership. 'Hotham Park Zoo' was being used locally from about 1978-1984.
It is likely that the same guide book was reprinted several times. The introduction to the one the map comes from makes reference to visitor numbers 'By September 1955', so it is obviously later than that but may be the same in all other respects to the 1950 one. It was renamed 'Rainbow's End in about 1984, not long after the bears escaped and presumably when the animals were replaced with rides. I am not sure when the name changed from Pets' Corner to Zootopia but 1978 might be about right and co-incided with a change of ownership. 'Hotham Park Zoo' was being used locally from about 1978-1984.