1. Swamps, canals, and the locations of ancient Maya cities;Adams;Antiquity,1980
2. Gardens on swamps;Armillas;Science,1971
3. Los camellones de caymbe en Sierra de Ecuador;Batchelor;America Indigena,1980
4. The Conditions of Agricultural Growth: The Economcis of Agrarian Change Under Population Pressure;Boserup,1965