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.

Description
Physical Description:	161 pages : illustrations, plates (3 in pocket) maps (2 folded, 1 color, in pocket) ; 26 cm.
Bibliography:	Bibliography: pages 138-141.