Notae latinae
an account of abbreviation in Latin MSS. of the early minuscule period, c. 700-850.

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The title shows the contents: a systematic description of abbreviations used in Latin manuscripts during the early medieval period. Every editor of Latin texts must have it. Though it is now nearly a hundred years old, it has never been superceded.
Latin Abbreviationsmedieval periodmanuscriptsEnglishIrishInsularscript