http://book.klll.cc/ebooks/author/5648.opds?sort_order=title 2025-08-16T13:58:07Z Books by Huygens, Christiaan (sorted alphabetically) Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-08-16T13:58:07Z https://book.klll.cc/ebooks/author/5648.opds?sort_order=release_date Sort by Release Date 2025-08-16T13:58:07Z https://book.klll.cc/ebooks/author/5648.opds?sort_order=downloads Sort by Popularity 2025-08-16T13:58:07Z https://nl.wikipedia.org/wiki/Christiaan_Huygens See also: nl.wikipedia 2025-08-16T13:58:07Z https://en.wikipedia.org/wiki/Christiaan_Huygens See also: en.wikipedia 2025-08-16T13:58:07Z https://book.klll.cc/ebooks/71191.opds celestial worlds discover'd : or, conjectures concerning the inhabitants, plants and productions of the worlds in the planets Christiaan Huygens 2025-08-16T13:58:07Z https://book.klll.cc/ebooks/14725.opds Treatise on light : In which are explained the causes of that which occurs in reflexion, & in refraction and particularly in the strange refraction of Iceland crystal Christiaan Huygens