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Keroher, Grace C., 1901-
QE7 .K4 v.3
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QE7 .L49 1981 v.1
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North American Commission on Stratigraphic Nomenclature
QE7 .N67 1981
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Pakistan. Stratigraphic Nomenclature Committee
QE7 .P355 1962
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Mezhvedomstvennyĭ stratigraficheskiĭ komitet SSSR
QE7 .R696 1960