http://book.klll.cc/ebooks/author/48095.opds?sort_order=release_date 2025-11-16T13:42:38Z Books by Herschel, John F. W. (John Frederick William) Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-16T13:42:38Z https://en.wikipedia.org/wiki/John_Herschel See also: en.wikipedia 2025-11-16T13:42:38Z https://book.klll.cc/ebooks/54897.opds Preliminary Discourse on the Study of Natural Philosophy John F. W. Herschel