TY  - RPRT
TI  - Pyrrolidone - a new solvent for the methylation of humic acid
AU  - R.L. Wershaw
AU  - D.J. Pinckney
AU  - S.E. Booker
PY  - 1975
UR  - https://pubs.usgs.gov/publication/70156691
ID  - 70156691
ER  -