Employment and Related Statistics of Mines and Quarries, 1935
Tryon, F. G. (Frederick Gale), 1892-1940. National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques (U.S.). United States. Bureau of Mines. United States. Bureau of the Census.
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- Philadelphia, Pa.: Works Progress Administration, National Research Project and Dept. of the Interior, Bureau of Mines: Dept. of Commerce, Bureau of the Census
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