World War History 32 Campaigns 28 Biography 16 Naval operations 9 World War, 1939-1945 9 Juvenile literature 7 Personal narratives 7 Submarine 7 Causes 6 1939-1945 5 Aerial operations 4 Army 4 Foreign relations 4 Campaign 3 Diplomatic history 3 Military leadership 3 Pictorial works 3 Soldiers 3 Underground movements 3 Equipment and supplies 2 Generals 2 Germany 2 Heer 2 History, Military 2 Japanese occupation 2 Malaya 2 Military 2 Military intelligence 2 Naval operation 2