TY  - BOOK
AU  - Pearson,C.J.
TI  - Field crop ecosystems
SN  - 0444886753
AV  - SB185 .F54 1992
PY  - 1992///
CY  - Amsterdam, New York
PB  - Elsevier
KW  - Field crops
KW  - Cropping systems
UR  - http://www.loc.gov/catdir/enhancements/fy0601/92121903-d.html
ER  -