MIDDLE AMERICAN FOLK SOIL TAXONOMYFootnote∗∗This paper is based in part upon research supported by the National Science Foundation Grant BNS 7725659 to Barbara J. Williams. We gratefully acknowledge the International Maize and Wheat Improvement Center (CIMMYT) and the Graduate College of the National School of Agriculture, Chapingo, Mexico, for facilitating field work, especially Donald Winkelmann, Heliodoro Díaz Cisneros, Laura Helgera, and Lucila Gómez Sahagún. We thank Heriberto E. Cuanalo de la Cerda, Efraím Hernández X., and H. R. Harvey for fruitful discussions during the course of research, Cecil H. Brown and William Denevan for reviewing and providing helpful comments on the manuscript, and Kenneth Winter for statistical analyses.
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