1. 1
    Published 1987
    ...United Nations Environmental Programme,...
    Book
  2. 2
    ...United Nations Environment Programme,...
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    Electronic eBook
  3. 3
    Published 2002
    ...Earthscan, for the United Nations Environment Programme,...
    Book
  4. 4
    Published 1999
    ...Earthscan for and on behalf of the United Nations Environment Programme,...
    Book
  5. 5
    Published 2007
    ...United Nations Environment Programme ; Stationery Office [distributor],...
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    Book
  6. 6
    Published 1997
    ...United Nations Environment Programme ; Oxford University Press [distributor],...
    Book