TY  - RPRT
TI  - Map showing thickness of overburden, Vienna Quadrangle, Virginia and Maryland
AU  - Sherman K. Neuschel
AU  - A.J. Froelich
PY  - 1975
DO  - 10.3133/ofr75520
UR  - https://pubs.usgs.gov/publication/ofr75520
ID  - ofr75520
ER  -