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  1. 1
    Published 1976
    Book

    Proceedings [of the] Seminar on Ecotoxicology, Paulino G. Garcia Memorial Hall, Pedro Gill St., Manila, 24 Mar. 1976.
  2. 2
    by Yapp, W B
    Published 1972
    Book

    Production, pollution, protection
  3. 3
    by Yapp, William Brunsdon
    Published 1972
    Book

    Production, pollution, protection.
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