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Symposium: Perception and natural resources
Quinney, Dean N., (1964)
Valuing non-market priced recreational resources
Wennergren, E. Boyd, (1964)
Problems in federal management of natural resources for recreation
Foss, Phillip O., (1965)
Pennsylvania's water resource problems
Goddard, Maurice K., (1962)
What the United States can learn
Goddard, Maurice K., (1961)