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Elements of Abbreviation in Medieval Latin Paleography by Adriano Cappelli
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Dizionario Di Abbreviature Latine Ed Italiane - Cappelli Adriano | Libro Hoepli 05/2011 - HOEPLI.it
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File:Adriano Cappelli (1859-1942) - Lexicon Abbreviaturarum, J.J. Weber Leipzig, 1902 (page 208 crop) - Manual styles for the character I,J.jpg - Wikimedia Commons