Hydrogeologic, geophysical, water-quality, transient-tracer, and flow-model analysis of the ground-water flow system near Dillon, Montana / by Daryll A. Pope ... [et al.] ; in cooperation with the Montana Department of Natural Resources and Conservation.
Helena, Mont. : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : Branch of Information Services [distributor],