Version history for Bedford,David R., Miller, David M., and Phelps, Geoffrey A. 2006, Preliminary surficial geologic map database of the Amboy 30x60 minute quadrangle, California: U.S. Geological Survey Open-File Report 2006-1165 [available on the World Wide Web at URL http://pubs.usgs.gov/of/2006/1165/ ] Version 1.0, August 25, 2006 Intital release online at http://pubs.usgs.gov/of/2006/1165/