1. Pesticides in soils and ground water in selected irrigated agricultural areas near Havre, Ronan, and Huntley, Montana Author/Creator: Clark, David W. 1951- (David Wayne), author Publication/Creation: Helena, Montana : U.S. Geological Survey, 1990 Resource Type: Book Access & Availability: Loading
2. Plan of study for the Regional Aquifer-System Analysis of the northern Rocky Mountains Intermontane Basins, Montana and Idaho Author/Creator: Clark, David W. 1951- (David Wayne), author Publication/Creation: Helena, Montana : U.S. Geological Survey, 1992 Resource Type: Book Access & Availability: Loading