Port of Philadelphia 5 Shipping--Pennsylvania--Philadelphia 3 Bridges 2 Church records and registers 2 Commerce--19th Century 2 Episcopal 2 Harbors 2 more ... Law and legislation 2 Maritime law 2 Navigation 2 Philadelphia (Pa.)--Commerce 2 Pilots and pilotage 2 Coal--Shipping--Philadelphia--20th century 1 Commerce--Philadelphia--19th century 1 Delaware River--Development--20th century 1 Design and construction 1 Electric railroads 1 Grain elevators 1 Historical pageants 1 Inland navigation 1 Maritime History--Commerce 1 Pennsylvania--Economic conditions--19th century 1 Philadelphia (Pa.)--Commerce--History--19th century 1 Philadelphia (Pa.)--Hog Island 1 Pickets 1 Politics and government 1 Railroads 1 Suicide victims 1 Trade Regulations--19th century 1 Trade and professional associations--Philadelphia (Pa.)--19th century 1 Trade and professional associations--Philadelphia (Pa.)--20th century 1 Trade--Pennsylvania--19th century 1 Traffic congestion 1 Tunnels 1 less ...