E.E. Purinton - Efficiency Analysis, undated, Folder: 16, Folder: 81. Purinton Family Papers, A&M 1964. West Virginia and Regional History Center.
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E.E. Purinton - Efficiency Analysis, undated, Folder: 16, Folder: 81. Purinton Family Papers, A&M 1964. West Virginia and Regional History Center. https://archives.lib.wvu.edu/repositories/2/archival_objects/194153 Accessed January 17, 2026.