Project Gutenberg 1993-01-01 Public domain in the USA. 260 Hemphill, Scott Pi en Mathematics Pi QA Dataset Mathematics Browsing: Mathematics Browsing: Science - General 731614 2009-12-28T04:50:40.818829 application/epub+zip 1026344 2009-12-28T04:50:47.928705 application/x-mobipocket-ebook 1434052 2021-01-01T05:42:54 text/plain; charset=us-ascii 695883 2021-01-01T05:42:54 text/plain; charset=us-ascii application/zip 1434011 2009-12-28T04:50:39.809828 text/plain 7752 2024-08-01T03:58:06.020801 application/rdf+xml Archives containing the RDF files for *all* our books can be downloaded at https://www.gutenberg.org/wiki/Gutenberg:Feeds#The_Complete_Project_Gutenberg_Catalog