More than 5,000 biographical entries in the World Encyclopedia vividly describe the life stories, contributions and influences of celebrities. Encyclopedia americana, edited for the needs of primary and secondary school curriculum, was published in Chicago. The first edition was revised year by year after 19 17 and 1925. This 22-volume book focuses on geography and biography, and also covers a wide range of disciplines such as business, psychology, government, energy, ecology and criminology. Written by authorities in physics, biology, social sciences and other fields. It has a complete reference system, and the names of related projects are attached at the end of the main theme projects. In addition to the general index, there are about 200 reading and learning guides on important subjects. Illustrations and maps are brightly colored and beautifully printed. 196 1 published a rare braille edition (145 volumes) at the beginning of the year, and 1964 published a large-character edition (30 volumes). Yearbooks are also published every year. The book was made into two CDs. The world book information retrieval of DOS (operating system) version can refer to encyclopedia articles and charts; Windows and Macin-tosh versions of the world book illustration information retrieval, you can consult articles, charts and thousands of illustrations and maps.