Agriculture Economic conditions Economic aspects 5 Description and travel 4 Economic history 4 Social conditions 4 Conditions économiques 3 more ... History 3 Mines and mineral resources 3 Slavery 2 %CHR 1 %PRO 1 1800 1 African Americans 1 Agricultural laborers 1 Agricultural machinery 1 Alcohol as fuel 1 Colonies 1 Commerce 1 Conditions sociales 1 Cotton growing 1 Credit 1 Crop yields 1 Farm tenancy 1 Germans 1 Indians of North America 1 Industrial policy 1 Industries 1 Logan, Dr. George (autograph) 1 Machinery in the workplace 1 New England 1 Pennsylvania 1 Pictorial works 1 Plantation life 1 Politics and government 1 Portuguese colonies 1 Public lands 1 Sharecropping 1 Slave trade 1 Social aspects 1 less ...