Kathleen R. Wilke 1979 Ground-water data collected in 1975-76 in the Swan and Avon valleys of western Montana and in 1978 in southwestern Missoula are presented in two tables. Table 1 is an inventory of 146 selected wells and table 2 lists chemical analyses of ground water from 52 wells. (Woodard-USGS) application/pdf 10.3133/ofr791491 en U.S. Geological Survey, Selected well inventory and chemical analyses of ground water, parts of Missoula and Powell counties, Montana reports