Congresses Land use Planning 19 Environmental aspects 10 Natural resources 8 Economic aspects 6 Management 6 المزيد ... Soils 6 Regional planning 5 Sustainable development 5 Agriculture 4 Land use, Rural 3 City planning 2 Coastal zone management 2 Conservation of natural resources 2 Data processing 2 Ecology 2 Ecotourism 2 Information storage and retrieval systems 2 Natural areas 2 Reclamation of land 2 Water resources development 2 Watershed management 2 Agricultural development projects 1 Arid regions 1 Arid regions ecology 1 Biodiversity 1 Communication in soil science 1 Community development 1 Culture conflict 1 أقل ...