Revision History for USGS Data Series 549 Joel E. Robinson, Thomas W. Sisson, and Darin D. Swinney Digital Topographic Map Showing the Extents of Glacial Ice and Perennial Snowfields at Mount Rainier, Washington, Based on the LiDAR Survey of September 2007 to October 2008 ----------------------------------------------------- Posted online at http://pubs.usgs.gov/ds/549/ December 9, 2010 -----------------------------------------------------