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  1. 1
    by Ridge, John Drew, 1909-
    Published 1976
    “...Pergamon Press,...”
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    Annotated bibliographies of mineral deposits in Africa, Asia (exclusive of the USSR) and Australasia.
  2. 2
    Published 1985
    “...Pergamon Press,...”
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    Alkaline ring complexes in Africa : proceedings of the International Conference on Alkaline Ring Complexes, Zaria, Nigeria, 6-10 December, 1983 /

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