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. 2021 Jul 1;57(7):881–894. doi: 10.1007/s00374-021-01580-2

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© The Author(s) 2021, corrected publication 2021

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Fig. 1 — Solid-state ¹³C NMR spectra with chemical shift for the four C functional groups including alkyl, O-alkyl, aromatic, and carbonyl groups (a spectra for humin in

source-separated organic compost from Audette et al. 2019)