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Nichols, D.  Agricultural Practices and Environmental Impacts of Aztec and Pre-Aztec Central Mexico. Oxford Research Encyclopedia of Environmental Science. Retrieved 18 Aug. 2022, from https://oxfordre.com/environmentalscience/view/10.1093/acrefore/9780199389414.001.0001/acrefore-9780199389414-e-175.

Nichols, Deborah L. "Agricultural Practices and Environmental Impacts of Aztec and Pre-Aztec Central Mexico." Oxford Research Encyclopedia of Environmental Science.  26. Oxford University Press. Date of access 18 Aug. 2022, <https://oxfordre.com/environmentalscience/view/10.1093/acrefore/9780199389414.001.0001/acrefore-9780199389414-e-175>

Nichols, Deborah L. "Agricultural Practices and Environmental Impacts of Aztec and Pre-Aztec Central Mexico." Oxford Research Encyclopedia of Environmental Science. 26 Feb. 2018; Accessed 18 Aug. 2022. https://oxfordre.com/environmentalscience/view/10.1093/acrefore/9780199389414.001.0001/acrefore-9780199389414-e-175.