Project Gutenberg 2009-08-26 Public domain in the USA. 71 Ribaucour, Albert 1845 1893 Étude des Élassoïdes, ou, Surfaces A Courbure Moyenne Nulle fr Geometry, Algebraic Curves Surfaces QA Text Mathematics FR Sciences et Techniques 1239366 2009-08-26T07:44:23 application/pdf 10446 2025-07-12T09:17:14.556082 application/rdf+xml 489893 2021-06-11T17:20:15 application/prs.tex 23408 2025-07-12T09:17:14.492097 image/jpeg 4790 2025-07-12T09:17:14.249088 image/jpeg 948990 2009-08-26T07:44:24 application/octet-stream application/zip 147040 2021-06-11T17:20:15 application/octet-stream application/zip Archives containing the RDF files for *all* our books can be downloaded at https://book.klll.cc/wiki/Gutenberg:Feeds#The_Complete_Project_Gutenberg_Catalog en.wikipedia