By Rivers, Trails, and Conservation Assistance Program, National Park Service, Washington, D.C. in cooperation with Leisure Studies Program, School of Hotel, Restaurant and Recreation Management, the Pennsylvania State University (Cooperative Agreement #CA-0765-9-8001). Authors: Roger L. Moore, Alan R. Graefe, Richard J. Gitelson, Elizabeth Porter. 2 copies.
By Rivers, Trails, and Conservation Assistance Program, National Park Service, Washington, D.C. in cooperation with Leisure Studies Program, School of Hotel, Restaurant and Recreation Management, the Pennsylvania State University (Cooperative Agreement #CA-0765-9-8001). Authors: Roger L. Moore, Alan R. Graefe, Richard J. Gitelson, Elizabeth Porter.
