http://book.klll.cc/ebooks/author/47399.opds 2025-09-20T09:59:29Z Books by Calver, George (sorted by popularity) Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-09-20T09:59:29Z https://book.klll.cc/ebooks/53494.opds New Edition of Hints on Silver-Glass Reflecting Telescopes Manufactured by Mr. G. Calver, F.R.A.S. George Calver