MIN-1965-01 Compilation of Colorado Bureau of Mines Annual Reports 1896-1965 (1964 cover example) MIN-1965-01 Compilation of Colorado Bureau of Mines Annual Reports 1896-1965
MI-06 Chemical Refining Study of Base and Precious Metal Ore in Colorado MI-06 Chemical Refining Study of Base and Precious Metal Ore in Colorado
B-10 Geology and Ore Deposits of the Gold Brick District B-10 Geology and Ore Deposits of the Gold Brick District, Colorado