Ships 160 History 142 Shipping 70 Emigration and immigration 63 Shipping--Pennsylvania--Philadelphia--18th century 46 Genealogy 33 Ship registers 30 more ... Shipping--Pennsylvania--Philadelphia--19th Century 29 Immigrants 28 Pilgrims (New Plymouth Colony) 28 Commerce 23 Sailing ships 23 Registers of births, etc 22 Shipbuilding 22 Naval operations 20 Passenger lists 19 International trade--18th century 17 Family 16 Shipwrecks 15 Sources 15 Steamboat lines 15 Railroads 14 Harbors 13 Passenger ships 13 Ship captains 13 Merchant marine 12 Navires 12 German Americans 11 Navigation 11 Boat & ship industry 10 History, Naval 10 Merchants--Pennsylvania--Philadelphia--18th century 10 Shipping--18th century 10 African Americans 9 Ships in art 9 Warships 9 Commerce--Philadelphia--19th century 8 Employment 8 Foreign relations 8 Histoire 8 less ...