Pte. 1 Water resource model: A historical summary (Nathaniel Wollman); -- Pte. 2 Modeling and information handling in environmental science (Martha Sager); -- Pte. 3 Models of agricultural water, land use and the environment (Earl O. Heady and Kenneth J. Nicol); -- Pte. 4 National economic models of industrial water use and waste treatment (Russell G. Thompson, James A. Calloway and Andrew k Schwartz, jr); -- Pte. 5 Ground water management and surface water development for irrigation (Oscar R. Burt); -- Pte. 6 Coordinating scale and sequencing decisions for wate resources projects (Donald Erlenkotter); -- Pte. 7 Water quality management and the distribution of emission rights by sealed tender markets (Emil D. Attanasi); -- Pte. 8 Incorporating outdoor recreation in a model of stream regulation and water quality improvement (Meir Barnea, Uri Shamir and Mordecai Shechter); -- Pte. 9 Modeling process substitutions by LP and MIP (James W. sawyer, Jr., Blair T. Bower and George O. G. Lôf); -- Pte.10 Institutions and objetives on the water, energy, environment interface (Marc Roberts); -- Pte. 11 Two methods for adding information to the resources management process (T. G. Roefs); -- Pte 12 Quasi-public goods: Pricing the commons (Richard A. Tybout), -- Pte. 13 Comments