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Microscopic study of Elkhorn coal bed at Jenkins, Letcher county, Ky.

Published Year

• 1930-1939 (1)

Subject

• Coal--Kentucky--Letcher County (1) *
• Microscopy (1)

Author

• O'Donnell, Hugh J., (1)
• Sprunk, G. C. (1)
• Thiessen, Reinhardt, (1) *

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