00970nam a2200253 a 450000100060000000300080000600500170001400800410003102000150007203500190008704000270010604100080013308200250014111100940016624502230026026000400048330000280052350500120055165000220056365000390058565000310062465000420065570000190069743675BD-RjUL20211209053732.0160626s1979    nyua          100 0 eng    a0080238637  a(BD-RjUL)43793  aDLCcDLCdBD-RjULbeng  aeng00a333.82223bECO 19792 aInternational Congress for Energy and the Ecosystemd(1978 :cUniversity of North Dakota)10aEcology and coal resource development :bbased on the International Congress for Energy and the Ecosystem, held at the University of North Dakota, Grand Forks, North Dakota, 12-16 June, 1978 /cedited by Mohan K. Wali.  aNew York :bPergamon Press,cc1979.  aVol.  :bill. ;c25 cm.0 aVol. 2- 0aCoalxCongresses. 0aCoal mines and miningxCongresses. 0aEnergy policyxCongresses. 0aEnvironmental protectionxCongresses.1 aWali, Mohan K.