Issued September 26, 1911. 
U. S. DEPARTMENT OF AGRICULTURE 
BIOLOGICAL SURVEY— BULLETIN No. 39 
HENRY W. HKNSHAW, Chief 
WOODPECKERS IN RELATION TO TREES 
AND WOOD PRODUCTS 
W. L. McATEE 
nit Biologist, Biological Survey 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1911 
