Happy reading: 1886: Guide to the garden of the zoological society of Philadelphia ... 1908: Guide to the garden of the Zoological society of Philadelphia ...
Philadelphia Zoo Early Guidebooks Just read them both cover to cover. I love this sort of thing; thank you.
My pleasure I also added links for other historical stuff in the Bronx Zoo thread, the London Zoo thread, the Paris Jardin des Plantes thread, Franklin Park Zoo (Boston) and the General Zoo thread (Hagenbeck's autobiography)