TY  - RPRT
TI  - 1:250,000-scale Hydrologic Units of the United States
AU  - Peter Steeves
AU  - Douglas Nebert
PY  - 1994
DO  - 10.3133/ofr19940236
UR  - https://pubs.usgs.gov/publication/ofr19940236
ID  - ofr19940236
ER  -