TY  - RPRT
TI  - Distinguishing black carbon from biogenic humic substances in soil clay fractions
AU  - D.A. Laird
AU  - M.A. Chappell
AU  - D.A. Martens
AU  - R.L. Wershaw
AU  - M. Thompson
PY  - 2008
DO  - 10.1016/j.geoderma.2007.10.025
UR  - https://pubs.usgs.gov/publication/70033723
ID  - 70033723
ER  -