Columbia subject headings:
Harvard subject headings:
Children's questions and answers
Princeton subject headings:
Art--Miscellanea--Juvenile literature.
Children's encyclopedias and dictionaries.
Children's questions and answers.
Mythology, Classical--Juvenile literature.
Natural history--Miscellanea--Juvenile literature.
Religion--History--Juvenile literature.
Science--Miscellanea--Juvenile literature.
Trivia and miscellanea.