Hennings, Glen & Morrell, Gerald. Low-Temperature Chemical Starting of a 200-Pound-Thrust JP-4 - Nitric Acid Rocket Engine Using a Three-Fluid Propellant Valve, report, June 30, 1955; (https://digital.library.unt.edu/ark:/67531/metadc52868/m1/1/: accessed April 16, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .