Beekmantown group : Lower Ordovician, of Maryland.

Beekmantown group : Lower Ordovician, of Maryland.

Bibliographic Details
Main Author:	Sando, William Jasper
Format:	Book
Language:	English
Published:	[New York] : [Geological Society of America], 1957.
Series:	Memoir (Geological Society of America) ; 68.
Subjects:	Geology, Stratigraphic > Ordovician. Paleontology > Ordovician. Geology > Maryland > Washington County. Paleontology > Maryland > Washington County.

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