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Topics in coal geochemistry—Short course [研究报告]
10.3133/ofr20181145U.S. Geological Survey. 2018-01-01
Kolker, Allan akolker@usgs.gov
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Mercury in U.S. coal—Priorities for new U.S. Geological Survey studies [研究报告]
10.3133/ofr20161033U.S. Geological Survey. 2016-01-01
Kolker, Allan akolker@usgs.gov
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