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by Donald J. Orth
U.S. Geological Survey 1989 Rev
Available at 3 libraries
U.S. Geological Survey 1987
Available at 5 libraries
U.S. G.P.O. 1971 2nd printing Geological Survey professional paper 567
Available at 1 libraries
U. S. Govt. Print. Off 1967 Geological Survey professional paper 567
Available at 2 libraries