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Fred. G. Plummer and M.G. Gowsell
Gov't print. off 1904 Geological Survey professional paper no. 33
Available at 1 libraries
prepared by F.G. Plummer ; from notes by Theodore F. Rixon and Arthur Dodwell
Goverment printing office 1904 Geological Survey professional paper no. 23
Available at 2 libraries
by Fred G. Plummer
Government Printing Office 1902 Geological Survey professional paper no. 6