TY - RPRT TI - Development of an 11- and 14-digit hydrologic unit boundary layer for the Lower Tennessee River Basin using a Geographic Information System AU - Hugh L. Nelson AU - Aimee C. Downs AU - Steve D. Crabtree AU - Doug H. Hines PY - 1997 DO - 10.3133/ofr97622 UR - https://pubs.usgs.gov/publication/ofr97622 ID - ofr97622 ER -