History 85 Politics and government 22 Histoire 14 Sewing machines 14 Social conditions 11 African Americans 10 Streets 9 more ... Civilization 7 Economic conditions 7 Machinery 7 World War, 1939-1945 7 Education 6 Machine-tools 6 Machinery industry 6 Defense industry 5 Employment 5 Family 5 Labor unions 5 Presidents 5 Women 5 Economic & industrial aspects 4 Emigration and immigration 4 Generals 4 Harvesting machinery 4 Machine shops 4 Monotype 4 Patents 4 Pickets 4 Social aspects 4 Steam-engines 4 War work 4 World War, 1914-1918 4 Campaigns 3 Catalogs 3 Church buildings 3 Civil engineering 3 Commercial catalogs 3 Conditions sociales 3 DNA 3 Description and travel 3 less ...