BIOLOGICAL SURVEY 
(Official title 
This book is Government property. The finder 
is requested to mail it to the Bureau op Bio¬ 
logical Survey, Department op Agriculture, 
Washington, D. C., or deliver it to the official 
whose name appears above. A detachable addressed 
frank will be found on the last page,; by tying this 
on the cover the book may be mailed without post¬ 
age or wrapping if fastened shut. 
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