TY  - RPRT
TI  - Geologic map of the Loudoun County, Virginia, part of the Harpers Ferry Quadrangle
AU  - C.S. Southworth
PY  - 1991
DO  - 10.3133/mf2173
UR  - https://pubs.usgs.gov/publication/mf2173
ID  - mf2173
ER  -