Book

http://cavediggers.com/vertical/

"Vertical is a definitive guide to vertical cave exploration techniques. It is for anyone who uses ropes to explore caves."

Published online at cavediggers.com as a pdf for each chapter.

Available for purchase as a bound book in color or black and white as well.

http://www.archive.org/details/cavesbeyondthest008643mbp

Free download of this great book in pdf, djvu or flipbook format.