General Geology of the Hahns Peak and Farwell Mountain Quadrangles, Routt County, Colorado /
By Kenneth Segerstrom and E. J. Young.
-- Washington : United States Government Printing Office, 1972
- 63 p. + plan. pleg. --
(Geological Survey Bulletin ; 1349).
En portada : With a discussion of Upper Triassic and Pre-Morrison Jurassic rocks / G.N. Pipiringos. -- Fecha real de registro 20-071973