Grade of ore
By: by Andrew V. Corry and O.E. Kiessling.
Contributors: Kiessling, O. E. 1901-; National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques (U.S.); United States. Bureau of Mines.
Series: Mineral technology and output per man studies ;; report no. E-6
Publisher: Works Progress Administration, National Research Project in cooperation with Dept. of the Interior, Bureau of Mines
Published: 1938
Place of publication: Philadelphia, Pa
Language: eng
Number of pages: 114
Subjects: Ores -- United States.; Mining machinery.
Notes: Includes bibliographical references.
"August 1938."