Previous ed.: i.e. New and revised ed. / by C.W.F. Noyce and J.M. Edwards. London : s.n., 1939.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Lliwedd by Harold Drasdo. Published by Climbers' Club in 1972. Publication and catalogue information, links to buy online and reader comments.