http://book.klll.cc/ebooks/subject/31152.opds2025-08-03T06:59:31ZBooks about Astronomical instruments (sorted by popularity)Free eBooks since 1971.Project Gutenberghttps://book.klll.ccwebmaster@gutenberg.orghttps://book.klll.cc/gutenberg/favicon.ico2512025-08-03T06:59:31Zhttps://book.klll.cc/ebooks/54420.opdsThe Practical Astronomer
Thomas Dick