The Ratio Tables: key to scale-focusing: theory of halftone by Arthur Fruwirth., 1926, Box: 201, Folder: 2. International Association for Identification Records, A&M 3518. West Virginia and Regional History Center.
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The Ratio Tables: key to scale-focusing: theory of halftone by Arthur Fruwirth., 1926, Box: 201, Folder: 2. International Association for Identification Records, A&M 3518. West Virginia and Regional History Center. https://archives.lib.wvu.edu/repositories/2/archival_objects/45888 Accessed June 29, 2024.