Open AccessCoal mining. [1968--72, by type of coal and by state; coal mines classified by size]
Author(s) -
Not Given Author
Publication year - 1974
Publication title -
osti oai (u.s. department of energy office of scientific and technical information)
Language(s) - English
Resource type - Reports
DOI - 10.2172/6073745
Subject(s) - coal , coal mining , mining engineering , environmental science , waste management , geology , engineering
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