Hart, R. W. & Bowker, R. C. An Apparatus for Measuring the Relative Wear of Sole Leathers, and the Results Obtained with Leather from Different Parts of a Hide, report, November 22, 1919; (https://digital.library.unt.edu/ark:/67531/metadc66508/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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