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2. ANSWERS: A Model for Watershed Planning
3. and 1982. ANSWERS users manual. USEPA, Region V, Chicago, Illinois. Purdue University, West Lafayette, IN., 54 pp.
4. 1979. Social Statistics, McGraw-Hill, London.
5. 1978. L'Ardéche: La Terre et Les Hommes du Vivarais, Edition L'Hermes, Lyon, 241 pp.