Official guide book to the New York Zoological Park :   (completely revised) /  
by William T. Hornaday ; illustrated by Elwin R. Sanborn. 
 - 23rd ed. 
 - New York :   New York Zoological Society,   1931. 
 - 224 p. :   mapas, fot. ;   20 cm. 
<br/><br/> Índice. 
<br/><br/><label>Subjects--Corporate Names: </label><br/>New York Zoological Park.---Guías.