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1
Trenton and sub-Trenton of outcrop areas in New York, Pennsylvania and Maryland /
by Swartz, Frank M. (Frank McKim), 1899-1982
[Harrisburg, Pa.] : Pennsylvania Bureau of Topographic and Geologic Survey, 1948

Government Document Book
2
Ordovician K-bentonites of eastern North America /
by Kolata, Dennis R.
Boulder, Colo. : Geological Society of America, 1996

Book
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