["Lear low approach system (31-1 and 31-3)," 1939 December]

Lear, William P. (William Powell), 1902-1978, ["Lear low approach system (31-1 and 31-3)," 1939 December], [2000-06-20_container_040]. Museum of Flight Digital Collections, accessed 13/12/2025, https://digitalcollections.museumofflight.org/nodes/view/5327