World War History 24 Campaigns 20 Biography 11 Naval operations 7 World War, 1939-1945 7 Submarine 6 Juvenile literature 5 Personal narratives 5 Causes 4 Army 3 Campaign 3 Foreign relations 3 Aerial operations 2 Diplomatic history 2 Military leadership 2 Naval operation 2 Pictorial works 2 Soldiers 2 Underground movements 2 1939-1945 1 Aerial operation, American 1 Air pilots, Military 1 Airbone troops 1 Airplanes, Military, Germany 1 Amphibious operations 1 Artillery operations, American 1 Battle of Great Britian 1 Campaigns France Normandy 1 Campaigns Pictorial works 1