TY  - BOOK
AU  - Frederick Valentine Emerson
AU  - Helen L. Emerson
TI  - Agricultural geology 
SN  - 9781144705709
PY  - 1920///
CY  - New York
PB  - John Willey & Sons
KW  - Agriculture GeologyMineralsOceansRocksWeatheringWind Work
ER  -