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Book Chapter
Horn S.P.  2007.  Late quaternary lake and swamp sediments: records of climate and environment. Central America: Geology, Resources, Hazards. 1:423-441.
Horn S.P.  2006.  Pre-Columbian maize agriculture in Costa Rice: Pollen and other evidence from lake and swamp sediments. Histories of Maize: Multidisciplinary Approaches to the Prehistory, Biogeography, Domestication, and Evolution of Maize. :367-380.