NX-A6 transducer evaluation report, report, December 1, 1968; (https://digital.library.unt.edu/ark:/67531/metadc876936/m1/1/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .
NX-A6 transducer evaluation report, report, December 1, 1968; (https://digital.library.unt.edu/ark:/67531/metadc876936/m1/1/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .