FYI! There are new USGS fact sheets on USTOPO and our Historic Quadrangle Scanning Project available. Apologies for any duplication. *US Topo—Topographic maps for the Nation <https://pubs.er.usgs.gov/publication/fs20173045>* USGS Fact Sheet 2017-3045 https://pubs.er.usgs.gov/publication/fs20173045 https://doi.org/10.3133/fs20173045 https://pubs.usgs.gov/fs/2017/3045/fs20173045.pdf *Scanning and georeferencing historical USGS quadrangles <https://pubs.er.usgs.gov/publication/fs20173048>* USGS Fact Sheet 2017-3048 https://pubs.er.usgs.gov/publication/fs20173048 https://doi.org/10.3133/fs20173048 https://pubs.usgs.gov/fs/2017/3048/fs20173048.pdf -- Tom Carlson, PhD, GISP Geographer National Map Liaison for Washington, Oregon and Idaho US Geological Survey 934 Broadway, Suite 300 Tacoma, WA 98402 253.552.1682 Office 253.552.1581 Fax *The National Map <http://nationalmap.gov> - Your Source for Topographic Information*