00831cam a22002411 4500 gs 12000336 DLC 20260227111313.0 760204s1912 dcu f000 0 eng gs 12000336 (OCoLC)1966401 DLC IDeKN OCoLC DLC QE75 .B9 no. 510 Lee, Willis T. (Willis Thomas), 1864-1926. Coal fields of Grand Mesa and the West Elk Mountains, Colorado, by Willis T. Lee. Washington, Government print. off., 1912. 237 p. illus., plates, map (in pocket) diagrs. 24 cm. U.S. Geological survey. Bulletin 510 At head of title: Department of the Interior. Title vignette. Coal mines and mining Colorado. Coal Colorado. 25150 25150