System maintenance June 24th between 9:00AM and 12:00PM CDT may cause brief service disruptions.

Edwards, George G.; Buell, Donald A.; Demele, Fred A. & Sutton, Fred B. Analysis of Wind-Tunnel Tests to a Mach Number of 0.90 of a Four-Engine Propeller-Driven Airplane Configuration Having a Wing With 40 Degrees of Sweepback and an Aspect Ratio of 10, report, September 1956; (https://digital.library.unt.edu/ark:/67531/metadc56014/m1/76/: accessed June 24, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .