TY  - BOOK
AU  - Sheaffer, Craig C.
AU  - Kristine M. Moncada.
TI  - Introduction to Agronomy : : Food, Crops, and Environment 
SN  - 9781111312336
U1  - 630 22 ed.
PY  - 2012///)
CY  - United States.
PB  - Cengage Learning, Inc.
N1  - An introduction to Agronomy
ER  -