AU  - Thompson,Louis M.
AU  - Troeh,Frederilck R.
TI  - Soils and Soil Fertililty / 
U1  - 631.4 
PY  - 1957///
CY  - New York : 
PB  - McGraw Hill Book Company , 
KW  - Soil Conservation
KW  - Soil Fertility
ER  -