The costs of congestion : an econometric analysis of wilderness recreation /Author: Cicchetti, Charles J.
Publisher: Cambridge, Mass. : Ballinger Pub. Co.,
Date: c1976. This title can be found in 1 Iowa libraries.
Structure and properties of a wilderness travel simulator : an application to the Spanish Peaks area /Author: Smith, Vincent Kerry,
Publisher: Baltimore : Published for Resources for the Future, by Johns Hopkins University Press,
Date: c1976. This title can be found in 2 Iowa libraries.
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