OSTERKAMP, W.R. MAGNITUDE AND FREQUENCY OF DEBRIS FLOWS AND AREAS OF HAZARD AND MOUNT SHASTA, NORTH CALIFORNIA/ W.R. OSTERKAMP - 21 pages : illustrations - U.S.GEOLOGICAL SURVEY PROFESSIONAL PAPER 1396-C . In English Subjects--Topical Terms: Mass wasting ---North California Universal Decimal Class. No.: 1396-C 551.3