TY  - BOOK
AU  - Wilbert-Walter Weir
AU  -  R.W. Gregory, 
TI  - Productive soils
U1  - 631.4 
PY  - 1946///
CY  - Chicago
PB  - J B Lippincott Company
N1  - Wilbert-Walter Weir & R.W. Gregory: Productive soils.  Chicago.  J B Lippincott Company, 1946.--(631.4WEI)
ER  -