TY  - RPRT
TI  - Natural gamma aeroradioactivity map of the Seneca and part of the Sterling quadrangles; Montgomery County, Maryland, and Loudoun and Fairfax Counties, Virginia
AU  - Jean Blanchett
AU  - Andrew Griscom
AU  - J. L. Vargo
PY  - 1966
DO  - 10.3133/gp564
UR  - https://pubs.usgs.gov/publication/gp564
ID  - gp564
ER  -