TY  - BOOK
AU  - Carlson, P.S
TI  - The biology of crop productivity/ ed by P.S. Carlson
SN  - 0121598500
AV  - S 494.5 .P75B56 C.1-7 
PY  - 1980///
CY  - New York
PB  - Academic Pr.
KW  - Crop Yields
ER  -