U.S. Geological Survey: Science for a Changing World - USGS visiaul identifier and link to main Web site at http://www.usgs.gov/

Photograph of a coal scientist at work

Figure 28. Photograph of a coal scientist at work identifying coal macerals and rank in a polished sample of coal using a high-powered, reflected-light microscope. Photograph by R.W. Stanton (U.S. Geological Survey).

U.S. Department of the Interior, U.S. Geological Survey
URL: https:// pubsdata.usgs.gov /pubs/circ/c1143/html/fig28.html
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