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Degasification of the Mary Lee coalbed near Oak Grove, Jefferson County, Ala., by vertical borehole in advance of mining
Title from title screen (viewed on July 18, 2008).
Mode of access: Internet at the National Institute for Occupational Safety and Health web site. Address as of 7/18/08: http://www.cdc.gov/niosh/mining/pubs/pdfs/ri7968.pdf ; current access available via PURL.
Degasification of the Mary Lee coalbed near Oak Grove, Jefferson County, Ala
Report of investigations (United States. Bureau of Mines) ; 7968