TY  - BOOK
AU  - Kohnke, Helmut.
AU  - Bertrand, Anson R.
TI  - Soil conservation
T2  - McGraw-Hill publications in the agricultural sciences
U1  - 631.45 
PY  - 1959///
CY  - New York
PB  - McGraw-Hill
KW  - Suelos
KW  - Conservación
ER  -