University of Illinois Urbana-Champaign

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Showing 31–60 of 2,554 items
Thumbnail for Distribution of the forms of sulphur in the coal bed
Distribution of the forms of sulphur in the coal bed
Yancey, Harry Fagan; Fraser, Thomas

Thumbnail for Preliminary report on organization and method of investigations.
Preliminary report on organization and method of investigations.
Illinois. Coal mining investigations. (Co-operative agreement.)

Thumbnail for Coal resources of District VIII (Danville).
Coal resources of District VIII (Danville).
Kay, Fred Hall; White, Kessack Duke

Thumbnail for Year-book for 1906
Year-book for 1906
Illinois State Geological Survey