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Development of Elastomer Cushions, FY71-4. Quarterly Report., report, September 1, 1972; Kansas City, Missouri. (https://digital.library.unt.edu/ark:/67531/metadc1035645/: accessed March 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.