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2. ORRRC Study Report No. 2, List of Public Outdoor Recreation Areas, Washington D.C., 1962 .
3. U.S. Department of Agriculture , Major Uses of Land and Water in the U.S. with Special Preference to Agriculture. Agr. Econ. Report No. 13, 1962 .
4. Governmental Provision.California Public Outdoor Recreation Plan Committee, California Public Outdoor Recreation Plan (2 parts), 1960 .
5. M. Clawson, A Series of Articles on Public Land Management and Finance , American Forests71 (1965 ).