http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
P.C. newspaper, magazine and periodical supplement
Publishers' circular newspaper, magazine and periodical supplement
Microfiche. Cambridge, England : Chadwyck-Healey, 1986. 5 microfiches. (Publishers' circular 1837-1900).
Publishers' circular and booksellers' record of British and foreign literature