TY  - RPRT
TI  - Preparation, homogenization, and storage of earth standards used and distributed by the International Humic Substances Society
AU  - W. L. Campbell
AU  - Mollie Malcolm
PY  - 1985
DO  - 10.1016/0146-6380(85)90060-9
UR  - https://pubs.usgs.gov/publication/70013034
ID  - 70013034
ER  -