Mariner 10: Spacecraft and mission profile from the National Space Science Data Center.
Mariner 10 to Venus and Mercury: Brief mission overview.
MarinerView: Freeware Windows viewer for the Mariner 10 images.
The Voyage of Mariner 10 Mission to Venus and Mercury: NASA History Office presents an online book, with diagrams and photos, telling the detailed story of the Mariner 10 mission.