• Mexico's Volcanoes : A Climbing Guide by R.J. Secor (Note Update Expected in late 2001)
• Backpacking in Mexico by Tim Burford (see also)
• Mexico : A Hiker's Guide to Mexico's Natural History by Jim Conrad
• Lonely Planet Mexico (Mexico, 7th Ed) 

• Highpointers Forum
• Usenet Groups

Climbing Information

• North American Classics
• Serac Mountaineering Club
• Route Information (laketravis.com) ****

• SummitPost Photos (****)
• Gerry's Photos of Orizaba

• Brian Kaufman's 1997 Trip Report
• John Montgomery Photo
• Adventure X

• North Dakota University Profile
• University of Buffalo Visualization of Volcanic Phenomena
• Peakware

• Peakware Summit Log

• picodeorizaba.com (Orizaba Mountain Shop)
• orizaba.com (squatted domain)