TY  - BOOK
AU  - P.W. Unger
AU  -  D.M. Van Doren, Jr.  American Society of Agronomy
TI  - Predicting tillage effects on soil physical properties and processes
U1  - 631.43 
PY  - 1982///
CY  - Madison
PB  - American Society of Agronomy
N1  - P.W. Unger; D.M. Van Doren, Jr. & American Society of Agronomy: Predicting tillage effects on soil physical properties and processes.  Madison.  American Society of Agronomy, 1982.--(631.43UNG)
ER  -