Andrews, G.W. (1976). Miocene marine diatoms from the Choptank Formation, Calvert County, Maryland. United States Geological Survey Professional Paper, (910): 27 pp., 7 pls., 2 figs., 1 tab.
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Andrews, G.W.
1976
Miocene marine diatoms from the Choptank Formation, Calvert County, Maryland
United States Geological Survey Professional Paper