Mode of access: Internet from the USGS web site. Address as of 4/10/08: http://pubs.usgs.gov/sim/2005/2867/SIM2867.pdf; current access via PURL. System requirements: PC with Internet access and ability (e.g. Adobe Reader) to handle 2.4 MB .pdf file.
At head of title: Astrogeology Research Program. Relief shown by contours and shading. Title from HTML index page (viewed on April 17, 2007). Includes text, location map and diagram.