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1.
Geology of Precambrian rocks, Central City district, Colorado, by P. K. Sims and D. J. Gable. by Series: Shorter contributions to general geology | Geological Survey professional paper ; 474-C.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publisher: Washington, U.S. Govt. Print. Off., 1964
Availability: Items available for reference: Archives: Not for loan (1)Call number: 550.8 SIM.

2.
Geology of the Empire quadrangle: Grand, Gilpin, and Clear Creek Counties, Colorado, / by William A. Braddock. by Series: Geological Survey professional paper ; 616.
Material type: Text Text; Format: print ; Literary form: Not fiction
Language: English Publisher: Washington, U.S. Govt. Print. Off.Copyright date: ©1969
Availability: Items available for reference: Archives: Not for loan (1)Call number: 557.886 BRA.