Cryotrap Checkout Test Report, report, October 18, 1968; (https://digital.library.unt.edu/ark:/67531/metadc873343/m1/1/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .
Cryotrap Checkout Test Report, report, October 18, 1968; (https://digital.library.unt.edu/ark:/67531/metadc873343/m1/1/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .