"Mines and mineral resources." . . "Geology Colorado La Plata County." . . "Colorado" . . "Geological Survey (U.S.)," . . "Geology." . . "United States. National Park Service," . . "Geology Colorado Montezuma County." . . "Mines and mineral resources Colorado La Plata County." . . "Mines and mineral resources Colorado Montezuma County." . . . . . . "Geology and fuel resources of the Mesa Verde area, Montezuma and La Plata Counties, Colorado"@en . . . . . "Geology and fuel resources of the Mesa Verde Area, Montezuma and La Plata Counties, Colorado"@en . . . "Prepared in cooperation with the National Park Service."@en . . . . . . . "Geology and fuel resources of the Mesa Verde area, Montezuma and La Plata Counties, Colo" . . . . . . . . . "Contributions to economic geology"@en . . . . . . .