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- a49006900 contributor B12857924.
- a49006900 created "1949]".
- a49006900 date "1949".
- a49006900 date "1949]".
- a49006900 dateCopyrighted "1949]".
- a49006900 description "Thesis--Columbia Univ.".
- a49006900 extent "707-779 p.".
- a49006900 issued "1949".
- a49006900 issued "1949]".
- a49006900 language "eng".
- a49006900 publisher "[n.p.,".
- a49006900 spatial "Pennsylvania.".
- a49006900 subject "Geology Pennsylvania.".
- a49006900 subject "Geology, Stratigraphic Ordovician.".
- a49006900 subject "QE727 .C7".
- a49006900 title "Lower Middle Ordovician of south-central Pennsylvania.".
- a49006900 type "text".