TY  - RPRT
TI  - Evaluation of conceptual models of natural organic matter (humus) from a consideration of the chemical and biochemical processes of humification
AU  - Robert L. Wershaw
PY  - 2004
DO  - 10.3133/sir20045121
UR  - https://pubs.usgs.gov/publication/sir20045121
ID  - sir20045121
ER  -