Ships 150 History 131 Shipping 69 Emigration and immigration 58 Shipping--Pennsylvania--Philadelphia--18th century 46 Genealogy 33 Ship registers 30 more ... Shipping--Pennsylvania--Philadelphia--19th Century 29 Immigrants 26 Pilgrims (New Plymouth Colony) 24 Commerce 23 Registers of births, etc 22 Shipbuilding 21 Naval operations 20 Sailing ships 20 Passenger lists 19 International trade--18th century 17 Sources 15 Family 14 Steamboat lines 14 Harbors 13 Ship captains 13 Shipwrecks 13 Merchant marine 12 Passenger ships 12 Railroads 12 German Americans 11 Boat & ship industry 10 Merchants--Pennsylvania--Philadelphia--18th century 10 Navigation 10 Navires 10 Shipping--18th century 10 Ships in art 9 African Americans 8 Commerce--Philadelphia--19th century 8 Employment 8 History, Naval 8 International trade--19th century 8 Vital records 8 Warships 8 less ...