Primary K: CombinedSecondary Di: AvalancheAuthor 1: Perla, RonaldAuthor 2: Martinelli, M.Publication: Fort Collins, CO: USDA Forest Service,Date: 1976Issue: 238 p. illus.Abstract: Handbook 489.A book for ski patrtollers, snow rangers &Abstract line 2: mountaineers.e: 4497