Merchant ships 2 Cape May (Sloop) 1 Cargo ships--Philadelphia (Pa.)--Nineteenth century 1 Coal--Shipping--Philadelphia--20th century 1 Delaware River--Development--20th century 1 International trade--19th century 1 Iron industry and trade--Pennsylvania 1 more ... Port of Philadelphia 1 Regulations and Inspection--Shipping--Philadelphia--19th century 1 Shipping--Pennsylvania--Philadelphia--19th Century 1 Ships--Equipment and supplies--19th century 1 less ...