Biography United States History 28 Presidents 21 Generals 16 Politics and government 13 World War, 1939-1945 11 Juvenile literature 8 Personal narratives, American 7 Case studies 6 Statesmen 6 Campaigns 5 History, Military 5 Leadership 5 Marine Corps 5 Soldiers 5 Admirals 4 Businessmen 4 Businesspeople 4 Intelligence officers 4 Legislators 4 Personal narratives 4 Aerial operations, American 3 African American legislators 3 Army 3 Chief executive officers 3 Civil War, 1861-1865 3 Foreign relations 3 Islamic fundamentalism 3 Management 3