Sanders, J. C.; Wilsted, H. D. & Mulcahy, B. A. Operating Temperatures of a Sodium-Cooled Exhaust Valve as Measured by a Thermocouple, report, December 1, 1943; (https://digital.library.unt.edu/ark:/67531/metadc61965/m1/1/: accessed August 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .