TY  - BOOK
AU  - Metcalfe, Darrel S
AU  - Elkins, Donald M
TI  - Crop production principles and practices
SN  - 0023807105
PY  - 1980///
CY  - London: 
PB  - Macmillian Publishing Co., INC., 
KW  - Agriculture
KW  - Food-population
KW  - Weather
ER  -