The Recreation Opportunity Spectrum: A Framework for Planning. Clark, R. & Stankey, G. Technical Report Management, and Research, US Dept of Agriculture, Forest Service, 1979.
bibtex   
@techreport{clark_recreation_1979,
	title = {The {Recreation} {Opportunity} {Spectrum}: {A} {Framework} for {Planning}},
	language = {en},
	institution = {Management, and Research, US Dept of Agriculture, Forest Service},
	author = {Clark, R.N. and Stankey, G.H.},
	year = {1979},
}

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