http://book.klll.cc/ebooks/author/7219.opds 2025-11-15T05:04:25Z Books by Hearn, George Whitehead Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-15T05:04:25Z https://book.klll.cc/ebooks/17204.opds Researches on curves of the second order George Whitehead Hearn