TY - RPRT TI - Delineation of the Troy Bedrock Valley and particle-tracking analysis of ground-water flow underlying Belvidere, Illinois AU - P.C. Mills AU - Keith J. Halford AU - R.P. Cobb PY - 2002 DO - 10.3133/wri024062 UR - https://pubs.usgs.gov/publication/wri024062 ID - wri024062 ER -