What is the topic heading of world book encyclopedia?

The World Book Encyclopedia does not have a single topic heading. It is a comprehensive encyclopedia, covering a vast range of subjects organized alphabetically by keywords.

For example, you can find information on:

* History: Ancient civilizations, major wars, historical figures

* Science: Physics, chemistry, biology, astronomy

* Geography: Countries, continents, natural wonders

* Culture: Art, music, literature, religion

* Technology: Computers, transportation, medicine

* Current Events: Recent news and important developments

The specific topics within the World Book Encyclopedia are too numerous to list here, but you can find a detailed table of contents online or in the printed version.