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Print Material
Author Haskell, A. Porter.

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

Imprint Philadelphia, Pa. : Works Progress Administration, 1938.


Location Call No. OPAC Message Status
 Axe Special Collections Picher Mining  Y 3.W 89/2:42/E-7    ---  Lib Use Only

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