TY  - RPRT
TI  - Geologic and hydrologic map reports for land-use planning in the Baltimore-Washington urban area
AU  - A.J. Froelich
AU  - John Tilton Hack
AU  - E. G. Otton
PY  - 1980
DO  - 10.3133/cir806
UR  - https://pubs.usgs.gov/publication/cir806
ID  - cir806
ER  -