Suggested citation and version history for Waythomas, Christopher F., 2007, Mid-Holocene sector collapse at Mount Spurr volcano, south-central Alaska, in, Haeussler, Peter J., and Galloway, John P., eds., Studies by the U.S. Geological Survey in Alaska, 2006: U.S. Geological Survey Professional Paper 1739-C, 15 p. [http://pubs.usgs.gov/pp/pp1739/c/]. Version 1.0, December 10, 2007 Initial release online at http://pubs.usgs.gov/pp/pp1739/c/