TY - RPRT TI - Mercury and other trace elements in sphalerite and wallrocks from central Kentucky, Tennessee, and Appalachian zinc districts AU - Janice L. Jolly AU - Allen Van Heyl PY - 1968 DO - 10.3133/b1252f UR - https://pubs.usgs.gov/publication/b1252F ID - b1252F ER -