Maps from the USGS
The USGS is a great source of beautiful and interesting maps. The main entry into USGS maps is a collection of links to other resources, including maps of other planets. USGS Publications Maps gets you closer to USGS maps. Omnia USGS Geology in partes tres, divisa est: Eastern Region, Central Region, and Western Region. The Western Region has nice entry point to their maps, as does the Central Region. If anyone knows about a similar collection for the Eastern Region, please let me know.