Suggested citation and version history for Youd, T.L., and Hoose, S.N. 1978, Historic ground failures in northern California triggered by earthquakes: U.S. Geological Survey, Professional Paper 993, 177 p., 5 plates [http://pubs.usgs.gov/pp/1978/pp0993/]. September 14, 2007 Added high-quality scans of the photographs in a folder July 5, 2007 Release online at http://pubs.usgs.gov/pp/1978/pp0993/ 1978 Initial release in print form