1. Ancient Maya impacts on soils and soil erosion;Beach;Catena,2006
2. A soils history of Mesoamerica and the Caribbean Islands;Beach,2006
3. Depression soils in the lowland tropics of northwestern Belize;Beach,2003
4. Archaeology as Human Ecology;Butzer,1982
5. Why the Mayan cities of the Peten district, Guatemala, were abandoned;Cooke;Journal of the Washington Academy of Sciences,1931