Rappelling: Rope Descending And Ascending Skills For Climbing, Caving, Canyoneering, And Rigging, First Edition (How To Climb Series): Amazon.co.uk: Bob Gaines: 9780762780808: Books
How to Rig a Retrievable Rappelling Anchor | Bowline - YouTube
Efficient climbing transitions: pre-rigging the rappel - YouTube
The benefits of the pre-rigged rappel — Alpine Savvy