Suggested citation and version history for Andersen, Matthew E., 2007, Grand Canyon humpback chub population improving: U.S. Geological Survey Fact Sheet 2007-3113, 2 p. [http://pubs.usgs.gov/fs/2007/3113/]. Version 1.0, December 17, 2007 Initial release online at http://pubs.usgs.gov/fs/2007/3113/