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2. Code of the Quipu - Wikipedia

   en.wikipedia.org/wiki/Code_of_the_Quipu

   Code of the Quipu is a book on the Inca system of recording numbers and other information by means of a quipu, a system of knotted strings.It was written by mathematician Marcia Ascher and anthropologist Robert Ascher, and published as Code of the Quipu: A Study in Media, Mathematics, and Culture by the University of Michigan Press in 1981.

3. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   As with Adobe Acrobat, Nitro PDF Pro's reader is free; but unlike Adobe's free reader, Nitro's free reader allows PDF creation (via a virtual printer driver, or by specifying a filename in the reader's interface, or by drag-'n-drop of a file to Nitro PDF Reader's Windows desktop icon); Ghostscript not needed. PagePlus: Proprietary: No

4. Javelin PDF Reader - Wikipedia

   en.wikipedia.org/wiki/Javelin_PDF_Reader

   Javelin PDF Reader is a full functionality secure PDF reader for Windows, macOS, iOS/iPadOS (iPad and iPhone) and Android, with support for Digital Rights Management (DRM) using encoded and encrypted PDF files in Drumlin's DRMX and DRMZ formats. PDF files that have been converted to the DRMX and DRMZ formats (using the free DrumlinPublisher ...

5. Marcia Ascher - Wikipedia

   en.wikipedia.org/wiki/Marcia_Ascher

   With her husband, Ascher co-authored the book Code of the Quipu: A Study in Media, Mathematics, and Culture (University of Michigan Press, 1981); it was republished in 1997 by Dover Books as Mathematics of the Incas: Code of the Quipu. [6]

6. Category:Free PDF readers - Wikipedia

   en.wikipedia.org/wiki/Category:Free_PDF_readers

   Free and open-source software portal; As follows from its parents, this category is for PDF readers/viewers that are free software — distributed with their source code and under a free software license.

7. Category:Free PDF software - Wikipedia

   en.wikipedia.org/wiki/Category:Free_PDF_software

   That is, software which can be freely used, copied, studied, modified, and redistributed by everyone that obtains a copy. Typically, this means software which is distributed with a free software license, and whose source code is available to anyone who receives a copy of the software. Free and open-source software portal