http://book.klll.cc/ebooks/author/56464.opds?sort_order=release_date 2026-01-13T22:01:06Z Books by United States. War Department. Division of Military Aeronautics Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2026-01-13T22:01:06Z https://en.wikipedia.org/wiki/Division_of_Military_Aeronautics See also: en.wikipedia 2026-01-13T22:01:06Z https://book.klll.cc/ebooks/71934.opds Balloon observation, and instructions on the subject of work in the basket United States. War Department. Division of Military Aeronautics