Copenhagen: Dan Fog Musikforlag, 1974 and 19179. Hardcover. Fine. Three volumes, bound in pale orange buckram, lettered in gilt on the spine. An exhaustive study with hundreds of musical examples. The H 159 volume states "Tonary of St. Benigne of Dijon." The remaining two volumes, companion volumes by definition, state " An Investigation Based on the Repertory in Codex H 159, Montpellier." The volumes appear to be unopened and unread. Fine examples in all respects.