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HELMENS, Karin F.: Neogene-Quaternary Geology of the High Plain of Bogo- ta (Eastern Cordillera, Colombia). Stratigraphy, Paleoenvironments and Landscape Evolution. 1990. (Diss.Bot., Bd. 163). 2 maps. VI,202 p.gr8vo. Paper bd. (43189) 47.00
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