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Librarians became especially active, using borrowed access passwords to download copies of scientific and scholarly articles from Western Internet sources, then uploading them to RuNet. In the early 21st century, the efforts became coordinated, and integrated into one massive system known as Library Genesis, or LibGen, around 2008.
The Ngram Viewer is a service connected to Google Books that graphs the frequency of word usage across their book collection. The service is important for historians and linguists as it can provide an inside look into human culture through word use throughout time periods. [30]
Many of these books can be downloaded for free from websites like the Internet Archive, in formats that many e-readers support, such as PDF, TXT, and EPUB. Books in other formats may be converted to an e-reader-compatible format using e-book writing software, for example Calibre .
The concepts of open access and open source support the idea of open textbooks, digital textbooks that are free (gratis) and easy to distribute, modify and update (libre). Schools, teachers or professors may design their own open textbooks by gathering open access scholarly articles or other open access resources into one text or one curriculum.
In the Print/export section select Download as PDF. The rendering engine starts and a dialog appears to show the rendering progress. When rendering is complete, the dialog shows "The document file has been generated. Download the file to your computer." Click the download link to open the PDF in your selected PDF viewer.
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