Sequoia and Kings Canyon : natural sciences research plan 1966 Sumner, Lowell | Sprugel, George | Linn, Robert M. |
Colombia's national parks : an analysis of management problems and perceived values 1975 Meganck, Richard Albert |
Evaluación y bases para el manejo del parque nacional de Tingo Maria (Huánuco, Perú) 1972 Dourojeanni, Marc J. | Tovar S., Augusto |