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Coal; a petrographic approach.
- Format:
- Book
- Author/Creator:
- Koppe, Edwin F.
- Series:
- Progress report (Pennsylvania. Bureau of Topographic and Geologic Survey) ; M42.
- Bulletin ; M42
- Language:
- English
- Subjects (All):
- Coal--Pennsylvania.
- Coal.
- Pennsylvania.
- Physical Description:
- 35 pages : illustrations ; 23 cm.
- Place of Publication:
- [Harrisburg], [publisher not identified], 1960.
- OCLC:
- 1965096
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