U.S. DEPARTMENT OF AGRICULTURE 



AGRICULTURAL RESEARCH SERVICE 



HYATTSVILLE, MARYLAND 20782 



OFFICIAL BUSINESS 



PENALTY FOR PRIVATE USE. $300 



POSTAGE AND FEES PAID 



U.S. DEPARTMENT OF 



AGRICULTURE 



AGR 101 



Washington, D.C. 



Revised May 1977 



For sale by the Superintendent of Documents, U.S. Government Printing Office 



Washington, D.C. 20402 - Price 60 cents; 25% discount allowed on orders of 100 or more to one address 



Stock Number 001-000-03621-1 



There is a minimum charge of $1.00 for each mail order 



