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Indiana Geological Survey (IGS) Indiana coal quality paper records numbered by year 1954-1989 archived in red binders. These records are available in an electronic format through IGS publication Report of Progress 40, The Indiana Coal Quality Database: The Database and Interactive Map, by Agnieszka Drobniak and Maria Mastalerz, 2012.
Indiana Geological Survey coal analysis sample locations plotted on USGS 7.5-minute quadrangles for Indiana. Points correlate to IGS Coal Analysis either in red binders or copied to the Indiana Geological Survey Coal Quality Database, Report of Progress 40, 2012.
Preliminary data for Indiana Geological Survey (IGS) Bulletin 55, Reduction of Sulfur in Indiana Coal by Washability Techniques, Charles E Wier and Harold C Hutchison, 1977. Fifteen 1-ton bulk samples of Indiana coal were studied in detail by the IGS in an attempt to reduce the sulfur content. Sulfide, sulfate, organic sulfur, and total sulfur were determined for each fractional sample of coal obtained by screening and float-sink methods.
Original National Coal Resources Data System (NCRDS) paper data forms that were in original files but records not in current digital Indiana Geological Survey Coal Stratigraphic Database, Report of Progress 39, 2012; Quality data Indiana Geological Survey Coal Quality Database, Report of Progress 40, 2012.