1. Reducing underground production costs through enhanced face productivity;Chugh,2004
2. Cost and environmental impacts of out-of-seam dilution on Illinois clean coal;Patwardhan,2007
3. Trace elements in coal: occurrence and distribution;Gluskoter,1977
4. Waste minimization through underground coal deshaling;Luttrell,1996
5. Guidelines for sample collecting and analytical methods used in the US Geological Survey for determining chemical composition of coal;Swanson,1976