Colorado : Denver, 1993 .
1 v. : 23 cm.

Denver : Colorado Scientific Society, 1946 .
v. : , Depósito. 24 cm.

Denver : Geological Survey, 1967 .
n. : , Depósito. 28 cm.

Denver : Denver Equipment Company, 1965 .
v. : , Depósito. 27 cm.

By Miller, G. W..
Denver : The Daily Mining Record, 1906 .
489 p. : 20 cm.

Denver : The National Academy of Sciences, 1959 .
143 p. ; 23 cm.