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https://www.ars.usda.gov/midwest-area/stpaul/swmr/docs/biochar/
https://www.biochar.info/docs/biochar-general/Biochar-characterization-and-
https://www.tandfonline.com/doi/abs/10.3846/16486897.2017.1319375.pdf
https://iuss.org/19th%20WCSS/Symposium/pdf/2485.pdf
https://www.rffi.org/Library/Biochar_Research_Report.pdf