1. Summary of the San Juan structural basin regional aquifer-system analysis, New Mexico, Colorado, Arizona, and Utah Author/Creator: Levings, Gary W., author Publication/Creation: Albuquerque, New Mexico : U.S. Geological Survey, 1996 Resource Type: Book Access & Availability: Loading
2. Preliminary appraisal of ground water in and near the ancestral Missouri River valley, northeastern Montana Author/Creator: Levings, Gary W., author Publication/Creation: Helena, Montana : U.S. Geological Survey, 1986 Resource Type: Book Access & Availability: Loading
3. Potential effects of surface coal mining on the hydrology of the Greenleaf-Miller area, Ashland coal field, southeastern Montana Author/Creator: Levings, Gary W., author Publication/Creation: Helena, Montana : U.S. Geological Survey, 1983 Resource Type: Book Access & Availability: Loading