C19 forms the bibliographic spine of 19th century research. It comprises tens of millions of records and provides integrated access to the most important finding aids for books, periodicals, official publications, newspapers, archives, and reference material. It includes: Nineteenth-Century Short Title Catalogue, The Nineteenth Century, American Periodicals, British Periodicals, Cotgreave's Index, An Index to Legal Periodical Literature, Cumulative Index to Niles' Register 1811–1849, Periodicals Index Online, Poole's Index to Periodical Literature, Stead's Index to Periodical Literature, The Wellesley Index to Victorian Periodicals, 1824-1900, House of Commons Parliamentary Papers, Proceedings of the Old Bailey, The U.S. Serial Set, Archive Finder, Palmer's Index to The Times, The "Bookman" Directory of Booksellers, Publishers and Authors, and Dictionary of Nineteenth Century Journalism.