Wilcox, Fred & Pennington, Donald. Spreading of Exhaust Jet From 16 Inch Ream Jet at Mach Number 2.0, report, August 14, 1952; (https://digital.library.unt.edu/ark:/67531/metadc59315/m1/1/: accessed March 22, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .