http://book.klll.cc/ebooks/subject/28479.opds2025-08-28T09:45:17ZBooks about World War, 1914-1918 -- Naval operations -- Submarine -- Juvenile literature (sorted by popularity)Free eBooks since 1971.Project Gutenberghttps://book.klll.ccwebmaster@gutenberg.orghttps://book.klll.cc/gutenberg/favicon.ico2512025-08-28T09:45:17Zhttps://book.klll.cc/ebooks/49873.opdsThe Boys' Book of SubmarinesA. Frederick Collins and Virgil D. Collins