AU  - Thompson,Louis .M
AU  - Troch,Frederick .R
TI  - Soils and soil fertility. 
U1  - 631.4 
PY  - 1975///
CY  - New Delhi.
PB  - Tata Mcgraw-Hill Publishing Co, Ltd.
KW  - Soil Conservation
KW  - Soils and Soil Fertility
ER  -