TY  - BOOK
AU  - U.S. Department of Agriculture Bureau of Plant Industry, Soils and Agricultural Engineering. Soil Survey Staff.
TI  - Soil survey manual
T2  - U.S. Department Agriculture Handbook; no.18
U1  - 631.47(021) K9 
PY  - 1969///
CY  - Calcutta
PB  - Oxford & IBH
KW  - Soil survey
ER  -