Dangos 1 - 3 canlyniadau o 3 ar gyfer chwilio '', amser ymholiad: 0.01e Mireinio'r Canlyniadau
  1. 1

    International Working group on Project 5 ecological effects on human activities on the value and resources of lake, marshes, rivers, deltas, estuaries and coastal zones, Paris, 13-...

    Cyhoeddwyd 1975
    Llyfr

    International Working group on Project 5 ecological effects on human activities on the value and resources of lake, marshes, rivers, deltas, estuaries and coastal zones, Paris, 13-17 MY, 1974 ; final report. Programme on Man and the Biosphere, United Nations \educational, Scientifc and Cuyltural Organization.
  2. 2

    Pollution ecology of freshwater in invertebrates gan Hart, C. W.

    Cyhoeddwyd 1974
    Llyfr

    Pollution ecology of freshwater in invertebrates
  3. 3

    An ecological study of a freshwater ecosystem [microform] gan Altarejos, Josefina A.

    Cyhoeddwyd 1974
    Visual Material

    An ecological study of a freshwater ecosystem [microform]

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