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Changes in technology and labor requirements in the crushed-stone industry
1939, Works Progress Administration, National Research Project in cooperation with Dept. of the Interior, Bureau of Mines
in English
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Book Details
Edition Notes
Includes bibliographical references.
"February 1939."
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July 20, 2010 | Edited by WorkBot | add subjects from MARC records |
January 21, 2010 | Edited by WorkBot | add subjects and covers |
December 9, 2009 | Created by WorkBot | add works page |