TY  - BOOK
ED  - Yearbook of Agriculture.
ED  - E.U.A. Department of Agriculture.
TI  - Soil
U1  - 630.5 
PY  - 1957///
CY  - Washington
PB  - Goverment Printing Office
KW  - Suelos
KW  - Conservación
KW  - E.U.A
ER  -