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 / a compilation by M. Grace Wimarth.
Publication Info.
[Washington, D.C.] : Department of the Interior, United States Geological Survey, 1925.
Electronic reproduction. [S.l.] : HathiTrust Digital Library, 2010. MiAaHDL
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Master and use copy. Digital master created according to Benchmark for Faithful Digital Reproductions of Monographs and Serials, Version 1. Digital Library Federation, December 2002. http://purl.oclc.org/DLF/benchrepro0212 MiAaHDL
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digitized 2010 HathiTrust Digital Library committed to preserve pda MiAaHDL