TY  - RPRT
TI  - The seven-story river; geomorphology of the Potomac River Channel between Blockhouse Point, Maryland, and Georgetown, District of Columbia, with emphasis on the gorge complex below Great Falls
AU  - E-an Zen
PY  - 1997
DO  - 10.3133/ofr9760
UR  - https://pubs.usgs.gov/publication/ofr9760
ID  - ofr9760
ER  -