This ad is for a Brochure used to sell the World Book Encyclopedias . 

The following is a copy and paste regarding the World Book Encyclopedias.

The World Book Encyclopedia is an encyclopedia published in the United States. According to the company, its mission is to "enhance learning and reading for children around the world by developing trustworthy, engaging content to create products that will engage children of all ages at home, on the go, in the classroom or in libraries worldwide."[1] The encyclopedia was designed to cover major areas of knowledge uniformly, but it shows particular strength in scientific, technical, and medical subjects.[2]

World Book Encyclopedia

World Book Encyclopedia logo.png

Country

United States

Language

American English

Series

22-volumes

Subject

General

Genre

Reference encyclopedia

Publisher

Scott Fetzer Company, a subsidiary of Berkshire Hathaway

Publication date

1917; 103 years ago

Media type

Publication

Dewey Decimal

031.21

LC Class

AE5 .W55

It is based in Chicago, Illinois. Today, the company claims that World Book "is the most up-to-date commercial encyclopedia". According to the company, the latest edition, World Book Encyclopedia 2019, contains 14,000 pages distributed along 22 volumes and more than 17,000 articles in total which represents an increase of 7.05% from the last edition (1,200 articles more) [3]

World Book also publishes children's non-fiction and picture books under the Bright Connections Media imprint, and educational development and supplemental instructional resources through Incentive Publications by World Book.