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  1. 1
    Published 1993
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    McGraw-Hill encyclopedia of environmental science & engineering /
  2. 2
    Published 2010
    Subjects “...Environmental protection Encyclopedias....”
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    The environment encyclopedia and directory 2010.
  3. 3
    by Ashworth, William, 1942-
    Published 2001
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    Encyclopedia of environmental studies /
  4. 4
    Published 1995
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    Conservation and environmentalism : an encyclopedia /

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