TY  - BOOK
AU  - Bond,J.J.
AU  - Umberger,Dwaine E.
ED  - United States.
TI  - Technical and economic causes of productivity changes in U.S. wheat production, 1949-76
T2  - Technical bulletin - United States Department of Agriculture
U1  - 338.173110973 
PY  - 1979///
CY  - Washington, D.C.
PB  - United States Government Printing Office
KW  - Wheat
KW  - United States
KW  - Economic aspects
N1  - Cover title; Bibliography: p. 95-102
ER  -