History 172 Naval operations 60 Officers 42 Biography 31 History, Naval 29 Navy 20 Admirals 14 more ... Sailors 13 United States Navy--19th century 13 World War, 1914-1918 12 Armed Forces 11 Sources 11 United States Navy 11 World War, 1939-1945 11 Naval operations, American 9 Bibliography 8 Foreign relations 8 Uniforms 8 Appropriations and expenditures 7 Insignia 7 Politics and government 7 Regulations 7 Seamen 7 Naval art and science 6 Registers 6 Courts-martial and courts of inquiry 5 Lists of vessels 5 Medals, badges, decorations, etc 5 Pay, allowances, etc 5 Warships 5 Commerce 4 Description and travel 4 Frigates 4 Navies 4 Philadelphia Experiment, 1943 4 Physicians 4 Spanish-American War, 1898 4 United States Navy--18th century 4 Appointments and retirements 3 Armor-plate 3 less ...