TY  - BOOK
AU  - Clay,David E.,
AU  - Shanahan,John F.,
TI  - Gis applications in agriculture volume two : : nutrient management for energy efficiency / 
SN  - 9781420092707(hbk)
U1  - 631.81 
PY  - 2011///
CY  - New York
PB  - CRC Press
ER  -