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Estimate of Known Recoverable Reserves of Coking Coal in Clarion County, Pennsylvania
Report issued by the Bureau of Mines over investigations of coking-coal reserves of Clarion County, Pennsylvania. Methods used, and measurements of coal reserves are listed. This report includes tables, and maps.
Date:
May 1956
Creator:
Blaylock, D. W.; Dowd, James J.; Abernethy, R. F. & Reynolds, D. A.
System:
The UNT Digital Library
Ocher and Ochery Earths
Report about ocher or ochery earth, "a natural mineral pigment composed largely of clay permeated with hydrated iron (ferric oxide)" (p. 2). It includes information about the uses of choer, substitutes, artificial ocher, mining and local deposits, import and export of ocher, and related information.
Date:
May 1929
Creator:
Santmyers, R. M.
System:
The UNT Digital Library