http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Catalogue of additions to the manuscripts
British Library Catalogue of additions to the manuscripts
New series not published in chronological sequence.
Vols. for 1946/50-1956/65 prepared by: the Dept. of Manuscripts of the British Library.
British Museum catalogue of additions to the manuscripts