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Reduction Mills in Montana in 1925 (open access)

Reduction Mills in Montana in 1925

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.
System: The UNT Digital Library
Resistance of Metal-Mine Airways (open access)

Resistance of Metal-Mine Airways

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.
System: The UNT Digital Library