1. The economic value of wildlife resources in Texas;Adams,1983
2. Climates forets et désertification de l'Afrique Tropicale;Aubreville,1949
3. The use of forage shrubs in the Norte Chico of Chile;Benjamin,1980
4. Perspectives d'une Politique Agricole Commune: Le livre Vert de la Commission;EEC,1985
5. Desertification of arid lands;Dregne,1983