Stockham, J. & Rosinski, J. Preliminary Studies of Scavenging Systems Related to Radioactive Fallout. Letter Report No. 9 for August 1 to October 1, 1959, report, October 26, 1959; (https://digital.library.unt.edu/ark:/67531/metadc1027333/m1/1/: accessed March 18, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .