Hesburgh Libraries

The collection contains paper files from the later decades of Gümpel's career, including correspondence (notably, correspondence with Michel Huglo), transcriptions of medieval treatises, as well as notes, notebooks and index cards on various manuscripts. Near the end of his life, Gümpel was working on an edition of the anonymous 12-13th century treatise Diologus de musica, and there are many items related to this work in progress.