http://book.klll.cc/ebooks/subject/9975.opds?sort_order=downloads 2025-11-18T05:33:33Z Books about Surfaces Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-18T05:33:33Z https://book.klll.cc/ebooks/36856.opds General Investigations of Curved Surfaces of 1827 and 1825 Carl Friedrich Gauss 2025-11-18T05:33:33Z https://book.klll.cc/ebooks/29805.opds Étude des Élassoïdes, ou, Surfaces A Courbure Moyenne Nulle (French) Albert Ribaucour