1.
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Gland, Switzerland : Iucn, 1994.
English | G 26 KRA.W |
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2.
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[Washington, D.C.] : World Resources Institute in cooperation with United Nations Environment Programme, the World Conservation Union, 1995.
Spanish | G 26 NAT |
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3.
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Nairobi, Kenya : Acts Press, African Centre for Technology Studies, 1992.
English | G 252 ACH.I |
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