TY  - BOOK
ED  - United States.
TI  - Crop production: annual report of the National research programs
U1  - 631.050973 
PY  - 1979///
CY  - Washington, D.C.
PB  - U.S. Department of Agriculture, Science and Education Administration
KW  - Plants, Cultivated
KW  - Crop yields
KW  - Plant breeding
KW  - Agriculture
KW  - Research
KW  - United States
N1  - Includes Index
ER  -