1. D2797 Standard Practice for Preparing Coal Samples for Microscopical Analysis by Reflected Light, Petroleum Products, Lubricants, and Fossil Fuels; Gaseous Fuels; Coal and Coke, Sec. 5, V. 05.06,2015
2. D7708 Standard Test Method for Microscopical Determination of the Reflectance of Vitrinite Dispersed in Sedimentary Rocks, Petroleum Products, Lubricants, and Fossil Fuels; Gaseous Fuels; Coal and Coke, Sec. 5, V. 05.06,2015
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