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1
by Hayes, Philip T. (Philip Thayer), 1923-
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1972
Subjects:
“...Geology, Stratigraphic Ordovician....”[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1972
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Government Document
Book
2
by Hayes, Philip T. (Philip Thayer), 1923-, Cone, George C.
Washington : United States Department of the Interior, Geological Survey, 1975
Subjects:
“...Geology, Stratigraphic Ordovician....”Washington : United States Department of the Interior, Geological Survey, 1975
Government Document
Book