Introduction / John Bardach -- Rivers -- a geomorphic and chemical overview / Robert R. Curry -- What is a river? -- a zoological description / Kenneth W. Cummins -- Plant ecology in flowing water / John L. Blum -- Commentary / Ruth Patrick -- Man's impact on the Columbia River / Parker Trefethen -- The Delaware River -- a study in water quality management / Robert V. Thomann -- Man and the Illinois River / William C. Starrett -- The Nile River -- a case history / Desmond Hammerton -- Case history -- the River Thames / Kenneth H. Mann -- Uses of the Danube River / Reinhard Liepolt -- Commentary / E.D. LeCren -- Regulated discharge and the stream environment / Jack C. Fraser -- Morphometric changes / T. Blench -- Sedimentation (suspended solids) / H.A. Einstein -- A comparative assessment of thermal effects in some British and North American rivers / T.E. Langford -- Effects of pesticides and industrial waste on surface water use / William A. Brungs -- Radionuclides in river systems / Daniel J. Nelson, S.V. Kaye and R.S. Booth -- Nutrients / Walter M. Sanders -- Commentary / Theodore P. Vande Sande -- Rationalization of multiple use of rivers / John Cairns Jr. -- Multiple use of river systems -- an economic framework / James Crutchfield -- Political aspects of multiple use / John D. Dingell -- Summary of symposium / Justin W. Leonard.