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Recreation in the countryside : a spatial analysis
Coppock, John T., (1975)
Freizeit '74 : Dritter Deutscher Freizeitkongreß 28.5.1974 - 30.5.1974 in Dortmund
(1974)
Leisure, recreation and tourism: a model of leisure activity
Leimgruber, Walter, (1975)
Testimony on Water Resource Evaluation Procedures
Kalter, Robert J., (1969)
Alternatives, Criteria and Time Lags in Water Resource Development
Kalter, Robert J., (1970)
Economics in Water Resource Planning