History Politics and government 258 World War, 1939-1945 211 Biography 179 United States 125 Juvenile literature 115 Campaigns 109 Islam 103 Military art and science 83 Foreign relations 79 Armed Forces 71 History, Military 57 20th century 48 Sources 47 Communism 45 Civil War, 1861-1865 42 Terrorism 42 Social conditions 40 Economic conditions 39 Malaysia 38 Civilization 37 Great Britain 37 Malaya 37 Fiction 36 Pictorial works 35 Airplanes, Military 33 Military policy 31 World War, 1914-1918 30 Thesis 28 Description and travel 27