found: Work cat.: Two skiers near avalanche site on Black Buttes, n.d., via the Dwight Watson digital images collection, Apr. 7, 2008.
found: GNIS, Apr. 7, 2008(Black Buttes, summit, Wash., Whatcom County, 48°46ʹ09ʺN 121°51ʹ10ʺW; also lists Black Butte in Asotin, Grant, Klickitat, and Whitman Counties)
found: Washington place names, via WWW, Apr. 7, 2008(Black Buttes are on the southwest slope of Mt. Baker between Thunder and Deming glaciers in south central Whatcom County.)
notfound: Peakbagger.com, Apr. 7, 2008