Railroads 80 History 41 Roads 31 Description and travel 13 Finance 13 Buildings, structures, etc 10 Streets 8 more ... Canals 7 Cemeteries 7 Genealogy 7 Design and construction 6 Anniversaries, etc 5 Architecture 5 Coal trade 5 Early works to 1850 5 Surveying 5 African Americans 4 Corporations 4 Episcopalians 4 History, Local 4 Hotels 4 Railroad companies 4 Routes 4 Sermons, American 4 Slavery 4 Appropriations and expenditures 3 Biography 3 Family life--Personal correspondence--20th century 3 Historic buildings 3 Legal status, laws, etc 3 Lent 3 Location 3 Mansions 3 Pennsylvania--History 3 Philadelphia (Pa.)--Officials and employees 3 Philadelphia (Pa.)--Politics and government--20th century 3 Toll roads 3 Women's history--Pennsylvania--Philadelphia 3 Abolitionists 2 Antislavery movements 2 less ...