Requirements for Military Radiacs: [Part] 2. Effect of the Operator on the Energy-Directional Response of Portable Radiation Instruments, report, December 16, 1963; (https://digital.library.unt.edu/ark:/67531/metadc958112/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .