Kelley, K. K. Contributions to the Data on Theoretical Metallurgy: [Part] 3. The Free Energies of Vaporization and Vapor Pressures of Inorganic Substances, report, 1935; (https://digital.library.unt.edu/ark:/67531/metadc12551/m1/1/: accessed March 24, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .