A fragment containing parts of 17 three-voice polyphonic compositions and dating to the mid-i5th century. It was recovered from the binding of an Urbarium (a register of fief ownership) dated 1506-1628 and listed as belonging to the parish church of Gries, Bolzano, and now held in the archives of the Benedictine monastery of Muri-Gries. Under a single guard-sheet on the inner board were 12 sheets glued together into a solid mass, now separated again; 10 have musical notation, 2 only liturgical texts. Each sheet is cut from a bifolio, but does not correspond to a single sheet of music; there are thus fragments of 20 folios.

Four scribal hands; following Wright's nomenclature for Tr93, the main scribe is 'scribe A' while secondary scribes are 'scribe B' and 'scribe G' and a further scribe not identified in Tr93. There are many concordances with the Trent manuscripts; 3 pieces are apparently unica.

The Urbarium is in a sizteenth-century brown leather binding. Some decorative elements on the cover have parallels in Bavaria, a possible provenance for the fragments. Gabrielli however proposes that the fragment (and perhaps Tr93) wa copied in Bolazano.

visible on several leaves: a cross on mounts, which also appears in the first part of Tr93 c.1450-53

Some decorative elements: red ink and one decorated initial.