This 12th-Century Graduale was made in Augsburg. The upper part of the bifolium was preserved in the binding of an incunable printed in Strasburg (Inc. 622). The fragment contains chants for feasts of the Commemoration of the Virgin Mary, the first Sunday after Christmas, Saint Felix in pincis, and the second Sunday after Epiphany. In two parts; it has since been restored to a single piece.
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Budapest, Magyar Tudományos Akadémia Könyvtár és Információs Központ, T 175, T_175_1v_2r – Graduale Augustanum — https://fragmentarium.ms/view/page/F-z2kw