De musica - Public domain medieval manuscript

Ioan Cotton. (statement of responsibility)
Ms.
RISM B III, v. 4, p. 188-190. (citation/reference)
Notes 0027-4380 v. 8, no. 4, Sept. 1951 p. 650-659. (citation/reference)
Available also through the Library of Congress Web site as facsimile page images. (additional physical form)
Purchased ca. 1830 from M. Lemmens of Ghent by Sir Thomas Phillipps (Phillipps catalog no. 1281); purchased from the Phillipps library by the Library of Congress, Sept. 1949. DLC