USGS · gp484
Natural gamma aeroradioactivity map of Bel Air and vicinity, Harford, Baltimore, and Cecil Counties, Maryland
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R. W. Bromery, A. J. Petty, F. P. Gilbert. 1964. Natural gamma aeroradioactivity map of Bel Air and vicinity, Harford, Baltimore, and Cecil Counties, Maryland. https://doi.org/10.3133/gp484
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