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Haskell, A. Porter, Jr. and O.E. Kiessling

Technology, employment, and output per man in phosphate-rock mining, 1880-1937

Works Progress Administration, Philadelphia. 1938, xvi, 130p., wraps, front., graphs. WPA, National Research Project in cooperation with Department of the Interior, Bureau of Mines. Report no. E-7.

Cat.No: 40689

Price: $25.00

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