Landscape Land Resources 6 Agricultural Economics 3 Forests and Forest Trees (Biology and Ecology) 3 Land use 3 Natural Resource Economics, (New March 2000) 3 Social Psychology and Social Anthropology, (New March 2000) 3 Sustainability 3 Agriculture 2 Agriculture and state 2 Biodiversity 2 Biological Resources (General) 2 Case studies 2 Ecology 2 Ecosystems 2 Environmental impact 2 Environmental protection 2 Forest management 2 Forests 2 Gardening and environment 2 Lakes 2 Nature 2 Pollution 2 Pollution and Degradation 2 Public opinion 2 Silviculture and Forest Management 2 Water Resources 2 Water resources 2 Wilderness areas 2 Aesthetic value 1