http://book.klll.cc/ebooks/subject/28479.opds 2025-08-28T09:45:17Z Books about World War, 1914-1918 -- Naval operations -- Submarine -- 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 2025-08-28T09:45:17Z https://book.klll.cc/ebooks/49873.opds The Boys' Book of Submarines A. Frederick Collins and Virgil D. Collins