Agriculture Economic aspects 640 History 410 Economic conditions 158 Agriculture and state 145 Rural conditions 100 Food supply 87 more ... Social conditions 77 Land tenure 75 Peasants 64 Aspect économique 62 Social aspects 57 Histoire 50 Environmental aspects 43 Antiquities 41 Rural development 38 Politics and government 35 Food 34 Origin 33 Agricultural innovations 32 Landwirtschaft 31 Farmers 30 Social life and customs 29 Farms 28 Economic history 27 Economic policy 27 Research 26 Agricultural laborers 25 Indians of North America 25 Farm life 24 less ...