1. Butler, D.R. (1990), “The geography of rockfall hazards in Glacier National Park, Montana”,Geographical Bulletin, Vol. 32 No. 2, pp. 81‐8.
2. A History of High-Magnitude Snow Avalanches, Southern Glacier National Park, Montana, U.S.A.
3. Butler, D.R. and Malanson, G.P. (1996), “A major sediment pulse in a subalpine river caused by debris flows in Montana, USA”,Zeitschrift für Geomorphologie, Vol. 40 No. 4, pp. 525‐35.
4. Butler, D.R. and Walsh, S.J. (1994), “Site characteristics of debris flows and their relationship to Alpine treeline”,Physical Geography, Vol. 15 No. 2, pp. 181‐99.
5. Campbell, M.R. (1914), “The Glacier National Park – a popular guide to its geology and scenery”,USGS Bulletin, p. 600.