The Valley of Zermatt and the Central Pennine Alps, Map of the Matterhorn and the surrounding towns with a drawing of the route of Edward Whymper, United after p. 325, 1880, Edward
Ascent and Descent of the Matterhorn Outdoor map and Guide | FATMAP
Matterhorn - Wikipedia
Climbing Matterhorn – Everything you need to know: camps, routes, weather, huts, equipment, etc.
Plans for 2012 | Because it's there...
Climbing the Matterhorn, a video analysis of the ascent – Zermatterhorn