200 megabytes. According to the query, it takes 200Mb to find the e-book of The Wizard of Oz on the website of the World Digital Library and download the whole book. On April 2 1 day, 2009, the Universal Library website was officially launched in Paris, the headquarters of UNESCO, providing precious books, maps, manuscripts, movies, photos and so on for readers all over the world free of charge. The collection of the World Digital Library covers everything from books to archives. Users can search in seven languages, including Arabic, Chinese, English, French, Portuguese, Russian and Spanish, and other language tools are also applicable.