Nature encyclopedia /  
Editor G. Clyde Fisher. 
 - Nova York :   Halcyon House,   1940. 
 - 940 p. :   il. color. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Enciclopédia natural.
<br/><br/><label>Dewey Class. No.: </label>503