History 171 African Americans 38 Experiments 37 Handicraft 37 Science 35 Social life and customs 35 English language 30 more ... Activity programs 24 Race relations 24 Civil rights 22 Vocational guidance 22 Video games 21 Civilization 20 Study and teaching 20 Social aspects 18 Women 18 Authorship 17 Creative activities and seat work 17 World War, 1914-1918 17 Animals 15 Board books 15 Mathematics 15 Science projects 15 Children 14 Cooking 14 Sports 14 Vocabulary 14 History and criticism 13 Rap musicians 13 Singers 13 less ...