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Recreationist-Defined Versus Researcher-Defined Similarity Judgements in Substitutability Research. Jerry J. Vaske,Maureen P. Donnelly,and Dan L. Tweed. Journal of Leisure Research,vol. 15,no. 3,Third Quarter 1983,pp. 251-262. National Recreation and Park Association,3101 Park Center Drive,Alexandria,Virginia 22302. $17 annual subscription