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- Preparation characteristics of coal from Raleigh County, W. Va.
- Preparation characteristics of coal from McDowell County, W. Va.
- Preparation characteristics of coal from Harlan County, Ky.
- Preparation characteristics of coal from Wyoming County, W. Va.
- Preparation characteristics of coal from Lechter County, Ky.
- Use of pulverized rock as dense medium for salvaging coal from Pittsburgh-bed refuse