Environmental policy 116 Medio ambiente 108 Conservation of natural resources 89 Environmental management 85 Administración 83 History 48 Conservación 46 Política medioambiental 46 Recursos naturales 46 Política ambiental 44 Tourism 32 Ecology 28 Social life and customs 25 Turismo 25 Earth sciences 23 Ecología 23 Geociencias 23 Social aspects 23 Anthropology 22 Indians of Mexico 21 Historia 19 SOCIAL SCIENCE 16 Antropología 13 Folklore 13 Festivals 12 Manners and customs 11 Histoire 10 Environmental conditions 9 Social conditions 9 Aspectos sociales 8