Ores. Progress reports, Metallurgical Division: 16, Ore-testing studies, Ore-dressing tests and their significance, by W. F. Dietrich, A. L. Engel, and Morris Guggenheim; Analysis of molybdenum, by A. C. Rice and L. A. Yerkes; Report of tests, by C. W. Davis and staff of Ore-Testing Section.

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