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

Date :

Editeur / Publisher : Philadelphia, Pa. : Works Progress Administration, National Research Project in cooperation with Dept. of the Interior, Bureau of Mines , [1938]

Type : Livre / Book

Langue / Language : anglais / English