TY  - RPRT
TI  - Geologic map of the Loudoun County portion of the Middleburg Quadrangle, Virginia
AU  - S.W. Kline
AU  - P. T. Lyttle
AU  - A.J. Froelich
PY  - 1990
DO  - 10.3133/ofr90641
UR  - https://pubs.usgs.gov/publication/ofr90641
ID  - ofr90641
ER  -