Illustrated Guide Book - Chicago Zoological Park (1948)

Antique 1913 Popular Official Guide to the New York Zoological Park Illust. Book

1909 "OFFICIAL GUIDE TO THE NEW YORK ZOOLOGICAL PARK" by William T. Horanday

Antique 1921 New York Zoological Park Official Guide Book

OFFICIAL GUIDE of THE NEW YORK ZOOLOGICAL PARK by William Hornaday, 1917 ed.

Vintage Brookfield Zoo Official Guide Book Zoological Park Chicago History 1958

1938 Guide Book for Chicago Zoological Park Brookfield, Tinley Park, Loyola 1935

Vintage 1915 New York Zoological Park Official Popular Guide - Gorilla Edition