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biogeomorphology , terrestria l an d freshwate r system s proceeding s o f th e 26t h binghamto n symposiu m in geomorphology , hel d Octobe r 6-8,199 5 Edite d by C.R . Hup p U.S. Geological Survey, 12201 Sunrise Valley Drive, Reston, VA 22092, USA W.R. Osterkam p U.S. Geological Survey, 1675 WestAnklam Road, Tucson, AZ85745, USA A.D. Howar d Department of Environmental Sciences, Clark Hall, Charlottesville, VA 22903, USA Reprinte d fro m Geomorphology, Volum e 13 , Nos , 1- 4 ELSEVIE R Amsterda m — Lausann e — Ne w Yor k — Oxfor d — Shanno n — Toky o 199 5