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  1. 31
    Published 1994
    Book

    The Living earth a resource for learning
  2. 32
    by Roa, Michael L. 1946-
    Published 1993
    Book

    Environmental science activities kit
  3. 33
    by MacKay, Frances
    Published 1993
    Book

    Environmental studies
  4. 34
    by Cunningham, William P.
    Published 1992
    Book

    Environmental science a global concern
  5. 35
    Published 1991
    Book

    Environment, schools, and active learning
  6. 36
    Book

    Living in the environment an introduction to environmental science
  7. 37
    Published 1986
    Book

    Joy of learning handbook of environmental education activities
  8. 38
    Published 1983
    Book

    Glossary of environmental education terms.
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