Concealing-Coloration in the Animal Kingdom  Thayer, Gerad H. 

 - New York  The Macmillan  1909 
<br/><br/> Zz means Zoology Page No. 525-549 in A to Z Accession Register (Acc. No. Zz1-494) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Animal colour
<br/><br/><label>Dewey Class. No.: </label>Zz51