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Book Details
Table of Contents
Roots of human progress.
A philosophy for conservation.
Wanted: mineral industries colleges.
Edition Notes
Articles first published as Circulars 31, 33 and 35 of the Mineral Industries Experiment Station, Pennsylvania State College.
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January 24, 2010 | Edited by WorkBot | add more information to works |
December 9, 2009 | Created by WorkBot | add works page |