TY  - BOOK
CN  - S21
CN  - S21
CY  - Washington,
DA  - [1957]
ID  - 108539
KW  - Soils.
KW  - Soil conservation
KW  - Soils
N1  - Limited to the management of soil.
PB  - U.S. Govt. Print. Off.
PP  - Washington,
PY  - [1957]
T1  - Soil.
TI  - Soil.
VL  - 1957
ER  -