World War, 1939-1945 History 2,042 Campaigns 1,326 Guerre mondiale, 1939-1945 527 Foreign relations 361 Aerial operations, American 305 Diplomatic history 277 more ... Politics and government 277 Holocaust, Jewish (1939-1945) 234 Siena Donor: Vallely, M.L.S., John R. 232 Naval operations 201 Regimental histories 201 Histoire 191 Naval operations, American 190 Jews 181 History, Military 167 Weltkrieg 149 Aerial operations 145 Atrocities 140 Causes 137 Aerial operations, British 134 Underground movements 127 World War, 1914-1918 123 Generals 114 Armed Forces 111 Secret service 111 Submarine 106 Tank warfare 103 Aerial operations, German 102 Prisoners of war 99 less ...