Author

Contributions

  • Illinois State Geological Survey - Contributor
  • University of Illinois (Urbana-Champaign campus). Engineering Experiment Station - Contributor
  • United States. Bureau of Mines - Contributor

Publication

1918 - , Urbana, Ill, Illinois

Language

English

Word Count

6,000 words, Guess

Page Count

24 pages

Identifiers

Classifications

  • LCCTN805.I3 A4 no.20

Subjects

Series Statement

  • Cooperative coal mining series. Bulletin 20

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