http://book.klll.cc/ebooks/subject/39940.opds 2025-09-20T14:47:39Z Books about Aeronautics, Military -- United States (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 2025-09-20T14:47:39Z https://book.klll.cc/ebooks/72902.opds Learning to fly in the U.S. Army : a manual of aviation practice E. N. Fales