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GameFAQs: Ultima I
http://www.gamefaqs.com/computer/doswin/game/11096.html
Walkthroughs and user reviews.
The Complete Guide to Ultima 1: The First Age of D
http://www.pdragon.net/u1.html
Walkthrough and maps with all locations labelled.
Ultima I
http://www.uo.com/archive/ultima1/index.html
Walkthrough and technical information.