Maps. Colorado. Structure contour maps of Rangely anticline, Rio Blanco and Moffat Counties, Colo., by C. R. Thomas, assisted by J. W. Huddle. P. T. McCann. N. D. Raman, and C. O. Johnson; oil and gas investigations, preliminary map 41 [with text] by C. R. Thomas. Scale 1 m.=2 in., contour interval 100 ft. n. p.