@conference {11811, title = {Tourism in National Parks -- Cycles of Myth and Behavior}, booktitle = {2nd Conference on Scientific Research in the National Parks}, year = {1979}, month = {November 26-30}, pages = {180}, publisher = {University of Idaho}, organization = {University of Idaho}, keywords = {Conservation, Economy, Recreation management}, author = {Machlis, Gary E and Burch, William R} }