00744nam0-22002771i-450 99000259412040332120230405090916.0000259412FED01000259412(Aleph)000259412FED0100025941220000920d1957----km-y0itay50------baengGBCoal-mining economicsorganization and managementby John SinclairLondonPitman1957VI, 337 p.ill.23 cmSinclair,John105535ITUNINARICAUNIMARCBK9900025941204033218-10-8-RAs.i.ECAECACoal-mining economics3077876UNINAING01