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dc.contributor.authorHotchkiss, Willard Een_US
dc.date.accessioned2014-04-25T12:59:50Z
dc.date.available2014-04-25T12:59:50Z
dc.date.issued1939en_US
dc.identifier.citation436 pen_US
dc.identifier.urihttp://hdl.handle.net/10973/24196
dc.publisherWorks Projects Administration USPD National Research Project, Philadelphiaen_US
dc.titleMechanization, employment and output per man in Bituminous coal mining. Vol. IIen_US
dc.typeBooken_US
dc.subject.ccX9(D3551):92.84.73/G9.2en_US
dc.identifier.accnoGIPE021671en_US


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