TY  - BOOK
AU  - Kohnke, Helmut
AU  - Bertrand, Anson R. 
TI  - Soil conservation : Helmut Kohnke
U1  - 631.4  
PY  - 1959///
CY  - New York
PB  - Mcgraw - Hill book company
KW  - Soil conservation
KW  - Soil erosion
ER  -