http://book.klll.cc/ebooks/subject/23158.opds 2025-08-03T06:57:42Z Books about Ciphers -- Juvenile literature (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 2025-08-03T06:57:42Z https://book.klll.cc/ebooks/39149.opds Ciphers for the little folks : A method of teaching the greatest work of Sir Francis Bacon, baron of Verulam, viscount St. Albans Dorothy Crain