TY  - BOOK
ED  - United States.
TI  - Soil
T2  - Its Yearbook of agriculture,
AV  - S591 .U55 1957
PY  - 1957///]
CY  - Washington
PB  - U.S. Govt. Print. Off.
KW  - Soils
KW  - Soil conservation
KW  - United States
N1  - Limited to the management of soil
ER  -