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Reduction Mills in Montana in 1925

Description: List of reduction mills in Montana, compiled in the course of investigations of mineral resources of Montana. It includes information about each loaction including: the process, character of ore, when the mill was operated, and custom work; equipment and power used; and capacity in tons.
Date: March 1927
Creator: Gerry, C. N.
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Resistance of Metal-Mine Airways

Description: From Introduction: "This report describes the methods used and the results obtained in a series of experiments on the resistance that metal-mine airways offer to the flow of air."
Date: 1927
Creator: McElroy, G. E. & Richardson, A. S.
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