http://book.klll.cc/ebooks/subject/21611.opds?sort_order=release_date 2025-09-02T07:43:58Z Books about Scientific apparatus and instruments (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 2025-09-02T07:43:58Z https://book.klll.cc/ebooks/subject/21611.opds?sort_order=title Sort Alphabetically by Title 2025-09-02T07:43:58Z https://book.klll.cc/ebooks/subject/21611.opds?sort_order=downloads Sort by Popularity 2025-09-02T07:43:58Z 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 2025-09-02T07:43:58Z https://book.klll.cc/ebooks/39141.opds Early American Scientific Instruments and Their Makers Silvio A. Bedini 2025-09-02T07:43:58Z https://book.klll.cc/ebooks/36457.opds A Treatise on Meteorological Instruments Enrico Angelo Lodovico Negretti and Joseph Zambra