Hang Gliding, Paragliding, and Speedflying Books
A number of textbooks explain everything from the basics of hang gliding, paragliding and speedflying to the weather, cross-country flying, towing, and more. Here's a list to get started:
Hang Gliding
Hang Gliding Training Manual by Dennis Pagen
Performance Flying by Dennis Pagen
The Secrets of Champions by Dennis Pagen
Paragliding
Paragliding: A Pilot’s Training Manual by Mike Meier
The Art of Paragliding by Dennis Pagen
Mastering Paragliding by Kelly Farina
Weather
Understanding the Sky by Dennis Pagen
Towing
Towing Aloft by Dennis Pagen and Bill Bryden