TY  - BOOK
AU  - Weir, Wilbert Walter,
TI  - Lippincott`s Farm Manual : Productive Soils
U1  - 631 
PY  - 1920///
CY  - London
PB  - J. B. Lippincott Co.
KW  - Soil Science
KW  - Techniques, equipment & materials
ER  -