Technology, employment, and output per man in phosphate-rock mining, 1880-1937. A. Porter Haskell, Jr., O E. Kiessling.

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

Philadelphia: Works Progress Administration, 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