Excellent publication for ideas and projects by the National Advisory Committee for Aeronautics - NACA, predecessor to the National Air and Space Administration - NASA from the beginning of aviation to the early jet age. Very technical and detail oriented so if you have a background in aviation it can be very interesting, however, if you are not familiar with such details it might not be so interesting. As a reference a great book as reading material, again very, very technical. The book is well worth the price if you can find it. There is some history of the research personalities and overall progress with the NACA including the airfoils that were used internationally because of the trust and detailed research. Major aviation producer nations such as Australia, Belgium, Canada, China, France, Germany, Hungary, Italy, Japan, Netherlands, Romania, Soviet Union, Spain, Sweden, UK, USA and others utilized the research of the NACA in addition to their own as supplemental or even as a superior reference.
In deed an excellent reference for research and fact finding on various wing types, engines, airfoils, airflow and testing of almost every sort. We use this material at the International Resin Modellers Association (internationalresinmodellers.com) to make sure our kits for aircraft are as accurate as possible in the 1/72 scale resin format.