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Desertification. --- Tropical medicine.

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Environmental policy --- Natural resources --- Desertification --- Nature --- Human ecology

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Desertification. --- Desertification --- men --- environment --- Intensive farming --- Soil degradation --- Geographie physique --- Action anthropique --- China --- Africa South of Sahara --- USSR --- USA

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Ecology --- Nature --- Congresses --- Effect of human beings on --- Simulation methods --- Research --- Écosystème --- ecosystems --- Expérimentation --- experimentation --- environment --- Écologie --- ecology --- Simulation --- Méthodologie --- methodology --- Recherche --- research --- Impact sur l'environnement --- Environmental impact --- Désertification --- Desertification --- Dépôt acide --- acid deposition --- Acidification --- Politique de l'environnement --- Environmental policies --- Human beings --- Influence on nature --- experimentation. --- Desertification. --- Ecology - Congresses --- Nature - Effect of human beings on - Congresses. --- Ecology - Simulation methods - Congresses. --- Ecology - Research - Congresses. --- Scope

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Désertification --- Desertification --- case studies --- research --- research projects --- Research policies --- environment --- Amazonia --- Himalayan region --- 634.0 <4> --- -Arid regions forestry --- -Forest management --- -Social forestry programs --- -Social forestry projects --- Forestry projects --- Horticulture generally--?.0--Europa --- Arid regions forestry --- Social forestry programs --- Tropical Silviculture --- <676> --- Oost-Afrikaanse Staten. Oost-Afrika --- -Horticulture generally--?.0--Europa --- Tropical Silviculture. --- -Forest management. Business economics of forestry. Administration and organization of forest enterprises --- 634.0 <4> Horticulture generally--?.0--Europa --- -630*6 Forest management. Business economics of forestry. Administration and organization of forest enterprises --- Social forestry projects --- Agroforestry --- Forest management --- Forests and forestry --- Forest administration --- Forest plants --- Forest resource administration --- Forest resource management --- Forest stewardship --- Forest vegetation management --- Forestry management --- Stewardship, Forest --- Vegetation management, Forest --- Ecosystem management --- Natural resources --- Arid regions agriculture --- Agro-forestry --- Agriculture --- Tree crops --- Bibliography --- Citizen participation --- Citizen participation&delete& --- Social aspects --- Management --- Administration --- Control --- 630*6 --- Forest management. Business economics of forestry. Administration and organization of forest enterprises --- Environmental Sciences and Forestry. Forestry --- Silviculture --- Desertification. --- -Forest administration --- 630*6 Forest management. Business economics of forestry. Administration and organization of forest enterprises --- -Bibliography --- Environnement fragile