Dennis "Thresh" Fong, the first pro-gamer ever, was THE duel god back in early Quake1-Quake2 times. Best remembered for winning John Carmack´s Ferrari at the Red Annihilation tournament in 1997.
This is his strategy guide to Quake1. It went online on July 16th 1997, and is designed mainly for new to intermediate players.
Only available at www.quaketerminus.com