TY - RPRT TI - Tannins and terpenoids as major precursors of Suwannee River fulvic acid AU - Jerry A. Leenheer AU - Colleen E. Rostad PY - 2004 DO - 10.3133/sir20045276 UR - https://pubs.usgs.gov/publication/sir20045276 ID - sir20045276 ER -