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Cleaning tests of central Illinois coal

Analyses of Illinois coals.

Analyses of Virginia coals.

Analyses of Tennessee coals (including Georgia).

Low-gravity float-and-sink separations of bituminous-coal samples

Coal preparation practice in western Germany

Preparation characteristics of Maryland coals

Preparation characteristics of anthracites in the Santa River Valley, Peru

Froth-flotation practice in coal-preparation plants of Western Europe and Great Britain

Convertol process of coal-slurry treatment


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