Title: Natural gamma aeroradioactivity map of Bel Air and vicinity, Harford, Baltimore, and Cecil Counties, Maryland /
Authors: Bromery, Randolph Wilson, 1926-; Petty, A. J.; Gilbert, Francis P.; Geological Survey (U.S.)
Publisher: The Survey,
Year: 1964
Subjects: Radioactivity Measurement; Geology Maryland Harford County Maps.; Geology Maryland Baltimore County Maps.; Geology Maryland Cecil County Maps.; Harford County (Md.) Maps.; Baltimore County (Md.) Maps.; Cecil County (Md.) Maps.