Shield for Water Boiler, report, August 8, 1951; (https://digital.library.unt.edu/ark:/67531/metadc933801/m1/1/: accessed April 20, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .
Shield for Water Boiler, report, August 8, 1951; (https://digital.library.unt.edu/ark:/67531/metadc933801/m1/1/: accessed April 20, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .