TY  - BOOK
AU  - x, x
AU  - Gregory,R.W.
TI  - Fild crops management: x
SN  - x
U1  - 633/GRF 
PY  - 1949///
CY  - lChcago
PB  - J.B. Lipincott
KW  - Farm Produce
KW  - Fram Mnagement
N1  - x
ER  -