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I 19. 3 : 1757f : Mineral resources of the Encampment River Canyon Wilderness Study Area, Carbon County, Wyoming / by Edward A. Du Bray ... [and others].
I 19. 3 : 1758 : Mineral resources of the Barbours Creek and Shawvers Run wilderness study areas, Craig County, Virginia : an evaluation of the mineral potential of two study areas / by Frank G. Lesure.