Cambrian and Ordovician [deposits of Maryland - Maryland Geological Survey; Bassler, Ray S. (Ray Smith), 1878- (Baltimore, The Johns Hopkins press, 1919)
At head of title: Maryland geological survey.
"The seventh of a series of reports dealing with the systematic geology and paleontology of Maryland."
Versos of some of the plates on which explanations are given are numbered as pages.
Bibliography: p. 34-44.
Keywords: Geology -- Maryland; Geology, Stratigraphic -- Cambrian; Geology, Stratigraphic -- Ordovician; Fossils -- Maryland; Paleontology -- Cambrian; Paleontology -- Ordovician