TY  - BOOK
AU  - Peter S. Carlson
TI  - Biology of crop productivity
SN  - 0-12-159850-0
U1  - 633 
PY  - 1980///
CY  - New York
PB  - Academic Press
N1  - Peter S. Carlson: Biology of crop productivity.  New York.  Academic Press, 1980. 0-12-159850-0--(633CAR)
ER  -