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Mechanical mining in some bituminous-coal mines.

Control of Fires in Inactive Coal Formations in the United States

The Chemical Thermodynamic Properties of Hydrocarbons and Related Substances: The Use of n-Heptane as a Reference Substance for Low-Temperature Calorimetry

Demonstration and evaluation of five methods of secondary backfilling of strip-mine areas

Use of fly ash for remote filling of underground cavities and passageways

Revegetation studies at three strip-mine sites in north-central Pennsylvania

Control of fires in abandoned mines in the eastern bituminous region of the United States :a supplement to bulletin 590


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