History Agriculture 80 Collective farms 16 Peasants 8 Rural conditions 6 Agriculture and state 5 Antiquities 5 more ... Economic aspects 5 Fisheries 5 Gardens 5 Histoire 5 Hunting 5 Irrigation farming 5 Landscape gardening 5 Parks 5 Research 5 Agricultural implements 4 Ethnology 4 Feudalism 4 Irrigation 4 Landscape architecture 4 Plant breeders 4 Plant breeding 4 Plant geneticists 4 Traditional farming 4 Congresses 3 Decoration and ornament 3 Design 3 Economic conditions 3 Equipment and supplies 3 less ...