History 23 English literature 6 Politics and government 5 Description and travel 4 Psychology 4 Travel 4 World War, 1939-1945 4 American literature 3 Economic conditions 3 History and criticism 3 Technique 3 World War, 1914-1918 3 African Americans 2 Behaviorism (Psychology) 2 Character 2 Diplomatic relations 2 Foreign relations 2 Human anatomy 2 Indigenous peoples 2 Manners and customs 2 Painting 2 Race relations 2 Shipbuilding 2 Ships 2 Social conditions 2 Social life and customs 2 Social psychology 2 Spiritualism 2 Statesmen 2 Adolescence 1