TY  - RPRT
TI  - The chemical structure of highly aromatic humic acids in three volcanic ash soils as determined by dipolar dephasing NMR studies
AU  - Patrick G. Hatcher
AU  - M. Schnitzer
AU  - A. M. Vassallo
AU  - M. A. Wilson
PY  - 1989
DO  - 10.1016/0016-7037(89)90278-0
UR  - https://pubs.usgs.gov/publication/70015908
ID  - 70015908
ER  -