"Utah" . . "Denver Civic and Commercial Association." . . "Colorado" . . . . . "Letter transmitting economic maps of the region served ... by the Denver & Salt Lake Railroad"@en . . . . . . . "Letter of R.D. George, transmitting economic maps : prepared under his direction of the region served and to be served by the Denver & Salt Lake Railroad (Moffat Road) and transmitting a statement prepared by him about the coal, oil shale, hydrocarbon and other mineral deposits of economic value in that region"@en . . "Maps"@en . . . . . . . . . . . "Letter of R.D. George, state geologist of the State of Colorado, transmitting economic maps"@en .