http://book.klll.cc/ebooks/author/43289.opds?sort_order=release_date 2025-08-20T10:51:32Z Books by Potamian, Brother (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 2025-08-20T10:51:32Z https://book.klll.cc/ebooks/author/43289.opds?sort_order=title Sort Alphabetically by Title 2025-08-20T10:51:32Z https://book.klll.cc/ebooks/author/43289.opds?sort_order=downloads Sort by Popularity 2025-08-20T10:51:32Z https://book.klll.cc/ebooks/50524.opds The Letter of Petrus Peregrinus on the Magnet, A.D. 1269 active 13th century de Maricourt Pierre 2025-08-20T10:51:32Z https://book.klll.cc/ebooks/45446.opds Makers of Electricity James J. Walsh and Brother Potamian