81.		Tapada Nacional de Mafra : uma ode à natureza / Teresa Ramôa Autor: Ramôa, Teresa
82.		Future perspectives / David E. Gray, Seymour Greben Autor: Gray, David E. Coautor: ; Greben, Seymour
83.		Urban growth and the planning of outdoor recreation / Harvey S. Perioff, Lowdon Wingo, Jr. Autor: Perioff, Harvey S. Coautor: ; Wingo, Lowdon
84.		Recreation area planning: some physical and ecological requirements / Eugene Mattyasovsky Autor: Mattyasovsky, Eugene
85.		Carrying capacity: maintaining outdoor recreation quality / David W. Lime, George H. Stankey Autor: Lime, David W. Coautor: ; Stankey, George H.
86.		A recreation visitor travel simulation model as aid to management planning / Robert C. Lucas, Mordechai Shechter Autor: Lucas, Robert C. Coautor: ; Shechter, Mordechai
87.		Economic concepts relevant to the study of outdoor recreation / E. Boyd Wennergren, Warren E. Johnston Autor: Wennergren, E. Boyd Coautor: ; Johnston, Warren E.
88.		Some social concepts for outdoor recreation planning / George H. Stankey Autor: Stankey, George H.
89.		Comparison of methods for recreation evaluation / Jack L. Knetsch, Robert K. Davis Autor: Knetsch, Jack L. Coautor: ; Davis, Robert K.
90.		Recreational travel: a review and pilot study / Bryan Thompson Autor: Thompson, Bryan