Commerce 763 History 282 Economic conditions 74 Foreign relations 48 Politics and government 46 Description and travel 42 Histoire 41 more ... Colonies 38 Slave trade 36 Slavery 34 Esclaves 29 Commercial policy 25 Tariff 25 Economic history 24 Indians of North America 24 Commerce--Philadelphia--19th century 23 Railroads 23 Finance, commerce, confiscations, etc 22 Harbors 21 Industrie et commerce 21 Shipping 19 Conditions économiques 18 Merchants--Pennsylvania--Philadelphia--18th century 18 Commerce--Philadelphia--18th century 17 Finance 17 Periodicals 17 Diplomatic relations 16 Industries 16 Politique et gouvernement 16 Business enterprises 14 Directories 14 Relations extérieures 14 Commerce--West Indies--18th century 13 Descriptions et voyages 13 Sources 12 West Indies--Commerce 12 Merchants 11 Commerce--19th Century 10 Interstate commerce 10 Transportation 10 less ...