Workshop on environmental planning guidelines for strategies and plans, CATIE, Turrialba, Costa Rica,16-19 March, 1981 : proceedings : environmental planning approaches -------- sustainable development / The Commission on Environmental Planning. The Commission on Environmental Planning. Conservation of natural resources. 332.72 COW Includes bibliographical references. Gland : Commission on Environmental Planning, 1981. 1981. 1981 Text 35 p. in various pagings : eng