Books by Ralph Hultgren:
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Hultgren, Ralph, 1905-1993: Selected Values of Thermodynamic Properties of Metals and Alloys (New York: J. Wiley and Sons, c1963), also by Raymond L. Orr, Philip D. Anderson, and K. K. Kelley (page images at HathiTrust)
Additional books by Ralph Hultgren in the extended shelves:
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Hultgren, Ralph, 1905-1993: Investigation on temper brittleness of steel. (University of California, Dept. of Engineering, 1947), also by California. University. Institute of Engineering Research and United States. Office of Naval Research (page images at HathiTrust)
Find more by Ralph Hultgren at your library, or elsewhere.