Books - Viento bundle

Books - Viento bundle.
A bundle existing of the three popular Viento books:
- The Art of Gliding (german & english in 1 book) written by Simon Lemmerer.
- Next Year of Gliding (german & english in 1 book) written by Bert Schmelzer.
- Framing the Sky (german & english in 1 book) written by Tobias Barth.