http://book.klll.cc/ebooks/subject/31905.opds 2025-11-19T01:50:10Z Books about Numbers -- Juvenile literature Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-19T01:50:10Z https://book.klll.cc/ebooks/56127.opds Die Thurmuhr: eine Rechen-Fibel für kleine Kinder (German) F. G. Normann