Maps. Colorado. Structure contour map of exposed rocks in Rangely anticline, Rio Blanco and Moffat Counties, Colo., geology by C. R. Thomas, assisted by J. W. Huddle, F. T. McCann, N. D. Raman, and C. O. Johnson; oil and gas investigations, preliminary map 7 [with text] by C. R. Thomas. Scale 1 m. =2 in., contour interval 100 ft.