http://book.klll.cc/ebooks/subject/9097.opds?sort_order=release_date 2025-09-02T07:47:16Z Books about Astronomy -- Observers' manuals (sorted by release date) Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-09-02T07:47:16Z https://book.klll.cc/ebooks/subject/9097.opds?sort_order=title Sort Alphabetically by Title 2025-09-02T07:47:16Z https://book.klll.cc/ebooks/subject/9097.opds?sort_order=downloads Sort by Popularity 2025-09-02T07:47:16Z https://book.klll.cc/ebooks/57320.opds Telescopic Work for Starlight Evenings William F. Denning 2025-09-02T07:47:16Z https://book.klll.cc/ebooks/28752.opds Pleasures of the telescope Garrett Putman Serviss