TY  - RPRT
TI  - Digitized hydrologic units for the United States at a scale of 1:2,500,000
AU  - K.J. Lanfear
AU  - J.C. Schornick
PY  - 1985
DO  - 10.3133/ofr8592
UR  - https://pubs.usgs.gov/publication/ofr8592
ID  - ofr8592
ER  -