Interior view of the coal washability laboratory, Colorado School of Mines, Golden, Jefferson County, shows two men, one in a hard hat, siphoning liquid from a beaker. Glass jugs and galvinized cans with labels read 1.40--1.70.
Golden (Colo.)--1950-1980.; Coal--Colorado--Golden--1950-1980.; Universities & colleges--Colorado--Golden--1960-1980.; Colorado School of Mines.
[between 1950 and 1977]
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