1. Brown , William G. Measuring recreational benefits from natural resources with particular reference to the salmon-steelhead sport fishery in Oregon 1964
2. Brown , William G. Ajmer Singh Emery N. Castle An economic evaluation of the Oregon salmon and steelhead sport fisheryOregon Agr. Exp. Sta. Tech. Bull. 78 1964
3. The market mechanism, externalities, and land economics;Castle;J. Farm Economics,1965
4. Castle , Emery N. William G. Brown The economic value of a recreational resource: a case study of the Oregon salmon-steelhead sport fishery 1964