TY  - RPRT
TI  - Natural gamma aeroradioactivity map of Bel Air and vicinity, Harford, Baltimore, and Cecil Counties, Maryland
AU  - R. W. Bromery
AU  - A. J. Petty
AU  - F. P. Gilbert
PY  - 1964
DO  - 10.3133/gp484
UR  - https://pubs.usgs.gov/publication/gp484
ID  - gp484
ER  -