Hildreth, W.; Fierstein, J. (2012). The Novarupta-Katmai eruption of 1912- largest eruption of the twentieth century; centennial perspectives. Reston: USGS Professional Paper 1791. p. 135. DGGS29955Academia:47452498.
alaska.gov
dggs.alaska.gov
Hildreth, Wes; Firstein, Judy (2003). Geologic Map of the Katmai Volcanic Cluster, Katmai National Park, Alaska. USGS Geologic Investigations Series Pamphlet I-2778. pp. 15–16. DGGS14836.
Hildreth, W.; Fierstein, J. (2012). The Novarupta-Katmai eruption of 1912- largest eruption of the twentieth century; centennial perspectives. Reston: USGS Professional Paper 1791. p. 135. DGGS29955Academia:47452498.