TY  - BOOK
AU  - Gustafson, Axel Ferdinand.
TI  - Conservation of the soil
U1  - 631.45 
PY  - 1937///
CY  - New York
PB  - McGraw-Hill
KW  - ErosiÃ³n
KW  - Suelos
KW  - ConservaciÃ³n
ER  -