Issued September 30, 1911. 



U. S. DEPARTMENT OF AGRICULTURE, 

 FOREST SERVICE BULLETIN 86. 



HENRY S. GRAVES, Forester. 



WINDBREAKS: 



/> 



THEIR INFLUENCE AND VALUE. 



BY 



CARLOS G. BATES, 



FOREST ASSISTANT. 



WASHINGTON : 



GOVERNMENT PRINTING OFFICE. 

 1911. 



