TY - RPRT TI - The use of variable temperature and magic-angle sample spinning in studies of fulvic acids AU - W.L. Earl AU - R.L. Wershaw AU - K. A. Thorn PY - 1987 DO - 10.1016/0022-2364(87)90337-4 UR - https://pubs.usgs.gov/publication/70014266 ID - 70014266 ER -