| http://www.w3.org/ns/prov#value | - Petrographic Atlas of Coals and Carbons, including Fly Ash - shows coals, cokes, chars, carbons, graphites, and other natural and man-made carbonaceous materials under the optical microscope with the intent of characterizing these materials for both scientific and industrial applications; presented by Dr. John C. Crelling of Southern Illinois University at Carbondale.
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