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by Liebesny, F.
by Singh, Kuldeep.
by Parfitt, K. ed.
by -- U.S. Department of Health and Human Services (HHS)
by -- Division of Technological Research and Higher Education, Energy Information Section, UNESCO, Paris
by Wickens, G.F.
by Rahman, A.
by Hiscocks,E.S.
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by Patai, S.