TY  - BOOK
ED  - United States.
TI  - Drainage of agricultural land
AV  - S621 .U64
U1  - 631.6/2 
PY  - 1973///
PB  - U.S. Department of Agriculture
KW  - Drainage
N1  - "Reproduced ... from section 16--drainage of agricultural land of the national engineering handbook ... issued in 1971 by the Soil Conservation Service, U.S. Department of Agriculture."; Includes bibliographies
ER  -