Surficial geologic map of the Ashby-Lowell-Sterling-Billerica 11-quadrangle area in northeast-central Massachusetts / compiled by Byron D. Stone and Janet R. Stone ; U.S. Department of the Interior, U.S. Geological Survey ; prepared in Cooperation with the Commonwealth of Massachusetts, Office of the State Geologist and Executive Office of Energy and Environmental Affairs
Mode of access: Internet from the USGS web site. Address as of 9/27/07: http://pubs.usgs.gov/of/2006/1260/C/; current access via PURL. System requirements: PC with Internet access and software to read .pdf (Portable Document Format) files, ArcGIS shapefiles, .tif (Tagged Image Format) files, and Zip-compressed files.
General Note:
Title from HTML index page (viewed on Sept. 6, 2007). Includes location map.