TY  - RPRT
TI  - Limitations in the use of commercial humic acids in water and soil research
AU  - Ronald L. Malcolm
AU  - P. MacCarthy
PY  - 2002
DO  - 10.1021/es00151a009
UR  - https://pubs.usgs.gov/publication/70015165
ID  - 70015165
ER  -