1994 Colombia
Authors: Useche, M.
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Authors: Saldarriaga, J.G.
Authors: Martinez, X. and Galeano, G.
1993 Colombia
Authors: Instituto Geográfico Augustín Codazzi (Eds. Saldarriaga, J.G. and Hammen T. van der)
Authors: Duivenvoorden, J.F. and Lips, J.M.
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