Petrographic data were used to characterize carbonaceous shale, bituminous coal, and char at the Hanna, Wyoming, underground coal gasification site. Petrographic procedures for sample preparation, maceral analysis, and mean-maximum reflectance analysis are described. Photomicrographs showing vitrinite, pseudovitrinite, exinite, resinite, semi-fusinite, semi-macrinite, fusinite, macrinite, and sclerotinite are included. A petrographic classification of coal from the Hanna No. 1 coal seam is given. Rank of the Hanna coal was determined using the mean-maximum reflectance of the virtrinite, and this determination was compared to rank determined according to the AASTM method. The rank of the coal is a High Volatile C Bituminous coal. Char obtained from the Hanna 2, Phase 2 and 3 burn was characterized using a maceral analysis and a reflectance analysis. Possible applications of petrographic data for characterization of coal prior to underground coal gasification is explained.