TY  - BOOK
AU  - Kipps, M. S.
TI  - Production of field crops ; a textbook of agronomy
T2  - McGraw-Hill publications in the agricultural sciences
U1  - 631.5 
PY  - 1970///
CY  - New York
PB  - McGraw-Hill
KW  - Cultivos
KW  - Rendimiento
ER  -