USGS/Cascades Volcano Observatory, Vancouver, Washington
Volcanoes of the Portland Area, Oregon
--
John Elliot Allen, 1975,
Volcanoes of the Portland Area, Oregon:
State of Oregon, Department of Geology and Mineral Industries, The ORE-BIN,
v.37, no.9, September 1975
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04/24/08, Lyn Topinka