Mann, Ralph. An Examination of High School Failures as Revealed in the Literature of the Subject in Order to Determine the Nature, Extent, Causes and Remedies, thesis, 1950; (https://digital.library.unt.edu/ark:/67531/metadc130213/m1/76/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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