World War, 1939-1945 History 7,745 Campaigns 4,992 Regimental histories 1,374 Foreign relations 1,322 Politics and government 1,247 Holocaust, Jewish (1939-1945) 1,212 more ... Jews 1,179 Aerial operations, American 978 Underground movements 853 Diplomatic history 824 Atrocities 765 Naval operations 685 Secret service 609 Prisoners of war 604 Naval operations, American 589 Soldiers 541 Causes 526 History, Military 505 Aerial operations 473 Prisoners and prisons, German 471 Economic aspects 461 World War, 1914-1918 456 Concentration camps 452 Women 443 Prisoners and prisons, Japanese 436 Rescue 409 Peace 392 Submarine 377 Social conditions 359 less ...