World War, 1939-1945 21,494 History 6,783 Campaigns 4,294 Guerre mondiale, 1939-1945 2,028 Regimental histories 1,234 Foreign relations 1,035 Holocaust, Jewish (1939-1945) 1,020 more ... Politics and government 931 Jews 924 Aerial operations, American 871 Diplomatic history 666 Underground movements 662 Naval operations 583 Atrocities 575 Histoire 537 Prisoners of war 533 Naval operations, American 513 Secret service 488 History, Military 466 Soldiers 463 Aerial operations 417 Causes 414 World War, 1914-1918 408 Prisoners and prisons, Japanese 376 Weltkrieg 373 Prisoners and prisons, German 372 Military campaigns 369 Armed Forces 360 Women 357 Rescue 326 less ...