

Issued September 26, 1911. 



U. S. DEPARTMENT OF AGRICULTURE 

 BIOLOGICAL SURVEY— BULLETIN No. 39 



HENRY W. HENSHAW, Chief 



WOODPECKERS IN RELATION TO TREES 

 AND WOOD PRODUCTS 



SitOQttl 



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W. L. McATEE 



Assistant Biologist, Biological Survey 



WA SHINGTON 



GOVERNMENT PRINTING OFFICE 



1911 



