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Lexicon of geologic names of the United States
M. Grace Wilmarth · U.S. Govt. print. off.
2396 sayfa · 1938
Geology / Geology, Stratigraphic / Stratigraphic Geology / Nomenclature
The geologic time classification of the United States Geological survey compared with other classifications, accompanied by the original definitions of era, period and epoch terms
M. Grace Wilmarth · Govt. print. off.
138 sayfa · 1925
Geological time / Geology, Stratigraphic / Stratigraphic Geology