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by Jain, V.K.
by Mehra, P.N; .
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by Gause, G.F.
by Grisebach, H.
by Cox, K.
by Tittel, E.
by Mitchell, S.
by Tilak, B.D.
by Sloan, T.O.
by Baardesn, A.
by -- Central Fuel Research Institute, Dhanbad
by Aurand, L.W.
by Inglett, G.E.