Juvenile literature History 29 Miscellanea 23 Science 15 Experiments 12 Animals 11 Astronomy 11 Biography 11 Holocaust, Jewish (1939-1945) 10 Questions and answers 10 World War, 1939-1945 10 Technology 9 Plants 8 Curiosities and wonders 7 Encyclopedia 7 Malay language 7 Nature 7 Inventions 6 Planets 6 Botany 5 Causes 5 Children's encyclopedia and dictionaries 5 Dictionaries 5 English language 5 Social life and customs 5 World War 5 Air 4 Body, Human 4 Earth sciences 4 Human anatomy 4