TY  - BOOK
AU  - Metcalfe,Darrel S.
AU  - Elkins,Donald M.
AU  - Hughes,Harold De Mott
TI  - Crop production: principles and practices 
SN  - 0023807105
AV  - SB185 .H75 1980
U1  - 633 
PY  - 1980///
CY  - New York
PB  - Macmillan
KW  - Field crops
N1  - First-2d ed. by H. D. Hughes and E. R. Henson; 3d ed. by H. D. Hughes and D. S. Metcalfe; Includes bibliographies and index
ER  -