http://book.klll.cc/ebooks/author/56110.opds?sort_order=downloads 2025-11-16T22:46:42Z Books by Huygens, Constantijn Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-16T22:46:42Z https://en.wikipedia.org/wiki/Constantijn_Huygens_Jr. See also: en.wikipedia 2025-11-16T22:46:42Z https://nl.wikipedia.org/wiki/Constantijn_Huygens_jr. See also: nl.wikipedia 2025-11-16T22:46:42Z https://book.klll.cc/ebooks/71191.opds The celestial worlds discover'd : or, conjectures concerning the inhabitants, plants and productions of the worlds in the planets Christiaan Huygens