TY  - BOOK
ED  - United Nations. Department of Agriculture. Agricultural Research Service. Forest Service. Soil Conservation Service.
TI  - Principal federal sources of hydrologic data
U1  - 551.48021 21st ed.
PY  - 1900///?]
CY  - [s.l.]
PB  - Federal Power Commission
KW  - Hydrology
KW  - Surveys
N1  - Content: v.2
ER  -