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Supported by the Foreign Field Research Program, NAS-NRC, and financed by the Geography Branch, ONR, under contract Nonr-2300 (09). A grant from the Faculty Improvement Committee, Colorado State University, aided in the completion of the work.
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Wilken, G.C. The ecology of gathering in a Mexican farming region. Econ Bot 24, 286–295 (1970). https://doi.org/10.1007/BF02860664
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DOI: https://doi.org/10.1007/BF02860664