In the catalog of the collection each film is identified by the city, library, and call number of the manuscript. (The collection is arranged by call number.) The type of liturgical book to which the source belongs is indicated ("antiphoner," "gradual," etc.), as are date and place of origin, type of notation, and number of folios. For some sources additional comments are provided.The call numbers are the designations used for manuscripts in the system devised for the International Inventory of Musical Sources (RISM): a capital letter (or letters) indicating country, then a dash, then an abbreviation for the city, then a small letter indicating the library, an abbreviation representing the collection within the library (if any) to which the manuscript belongs, and a call number. In the case of the Bibliotheque Nationale, Paris, a typical designation would be F-Pn lat 776.
A Note about the Catalog
The information in the catalog, like the information on the boxes containing the individual films, is subject to correction. Each scholar who wishes to cite one of these sources is urged to verify all such data. References consulted by faculty and graduate students who have catalogued the collection include Corpus Antiphonalium Officii, Le Graduel Romain: Les Sources, the article "Sources: Plainsong" by John Emerson in The New Grove Dictionary of Music and Musicians, lists of sources in the publications of Corpus Troporum, and such articles as David Hiley's "The Norman Chant Traditions--Normandy, Britain, Sicily."