http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Falls of roof and coal in mines operating in Pittsburgh coal bed in Marion and Monongalia Counties, W.Va
[With data on employees, production, explosives and roof timber usage, accidents by severity and cause, workerscompensation costs, and deaths at 9 unnamed mines]
Record is based on bibliographic data in ProQuest U.S. Executive Branch Documents, 1910-1932. Reuse except for individual research requires license from ProQuest, LLC.
Electronic reproduction. [Bethesda, Md.] : ProQuest, 2012. digital, PDF file. ProQuest U.S. Executive Branch Documents, 1910-1932. Mode of access: World Wide Web via ProQuest website.
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