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by Geological Survey of Queensland; Rands, William H.
by Geological and Geographical Survey of th; Hayden, Ferdinand Vandeveer
by Survey, Geological
by Geological Survey of Alabama
by U. s. Department of Interior; U. s. Geological Survey
by U.s. Department of Agriculture Forest Service; U.S. Geological Survey; U.s. Bureau of Land Management
by Michigan Geological Survey
by Geological and Geographical Survey of th
by U.S. Department of the Interior; U.S. Geological Survey
by Friend, Milton; Franson, J. Christian; U.S. Geological Survey