1. Hydrogeology and simulation of water flow in strata above the Bearpaw Shale and equivalents of eastern Montana and northeastern Wyoming Author/Creator: Hotchkiss, W. R., author Publication/Creation: Helena, Montana : U.S. Geological Survey, 1986 Resource Type: Book Access & Availability: Loading
2. Hydrology and water chemistry of shallow aquifers along the upper Clark Fork, western Montana Author/Creator: Nimick, David A., author Publication/Creation: Helena, Montana : U.S. Geological Survey, [1993] Resource Type: Book Access & Availability: Loading