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Albers, M. A., Dobos, R. R., & Robotham, M. P. (2022). User Guide for the National Commodity Crop Productivity Index (NCCPI) Version 3.0, 2022. United States Department of Agriculture, Natural Resources Conservation Service, Soil and Plant Science Division, Washington, DC.
https://www.nrcs.usda.gov/sites/default/files/2023-01/NCCPI-User-Guide.pdf

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