This series contains Fowler’s original research, data and designs, documented by blueprints, reports, and charts. Also included are original drawings, also known as lofts. In addition, this series includes test reports by Fowler and by the University of Washington Aeronautics Laboratory regarding tests performed on Fowler-designed models. Items of note include photographs of full-size mockups of containerized air cargo planes, as well as photographs showing the "correct" method of handling cargo containers on the Fowler sky-truck. Of special interest are drawings and photographs of special uses Fowler proposed for the sky-truck such as a mobile surgical unit during World War II. Also of note are photographs of test models of the Fowler flap dating as early as 1927.