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English | C 389 UNEP.W |
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Frankfurt am Main : P. Lang, c1991.
German | G 58 PAU.P |
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Wallingford : CAB International in association with the Crawford Fund for International Agricultural Research, c1994.
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English | S 71 TRI.F |
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New York : United Nations Environmental Programme (UNEP), 1998.
English | G 252 UNEP.P |
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Oxford : EOLSS Publishers/UNESCO, 2002.
English | B 79 KNO.E |
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