An edition of Contributions to the study of coal: A proposed simplification of the Parr unit coal formula
(1934)
Contributions to the study of coal
A proposed simplification of the Parr unit coal formula
by Illinois State Geological Survey
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Contributions to the study of coal: A proposed simplification of the Parr unit coal formula
1934, Printed by authority of the state of Illinois
in English
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At head of title: State of Illinois. Department of Registration and Education. Division of the State Geological Survey.
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| November 5, 2020 | Edited by MARC Bot | import existing book |
| April 29, 2010 | Edited by WorkBot | merge works |
| January 22, 2010 | Edited by WorkBot | add more information to works |
| December 9, 2009 | Created by WorkBot | add works page |