1 Kyrie, 1 Magnificat, 3 psalms, 5 motets, 2 vernacular sacred pieces, 1 French secular piece, 3 textless pieces = 16 (many incomplete)
Isaac-1, (Sermisy)-1, anon-14
19 paper folios, 315 x 215. Fragile condition, many folios missing and damaged. Modern pencil pagination, incomplete. Original covers of crude brown leather, perhaps deerskin, secured by three leather thongs at spine. No index.
- Copied at Santa Eulalia, Guatemala. Inscription on first folio: "En el año De mill y quinientos y ochenta y Dos años hize este libro De canto de organo yo fran.co De leon Maestro." Purchased in 1969 from Lathrop C. Harper, New York.
Census-Catalogue of Manuscript Sources of Polyphonic Music 1400-1550