Eric Langmuir (1931–2005)

This edition is from the late '90s and I expect it is out of date in many respects by now, because of advances in clothing, equipment, techniques, electronics and science (e.g. understanding avalaches and avalanche survival theory have definitely moved on in the intervening time). That said, I expect the current edition is still the go-to comprehensive single volume guide to the subject, even if aspects of it have been done better elsewhere e.g. Peter Cliff's book on navigation.