All proceeds from this sale benefit the Aerospace Museum of California, a registered non-profit organization dedicated to preserving aviation history and fostering educational experiences. Please note that these books are sold as-is and may contain signs of wear such as rips, tears, missing pages, or other damage. We strive to provide accurate descriptions, but due to the nature of used books, all sales are final, and returns will not be accepted. If you have any questions or need more information about a specific item, please contact us prior to purchasing. Thank you for supporting our mission!