If you are looking to see if USC has access to a specific newspaper, start by searching the Journals option on the Libraries' homepage and then enter the title of the newspaper for which you are looking to see if we have access to the publication online or in print
Databases that index historical newspapers:
Reference books that index 19th century newspapers:
African-American Newspapers and Periodicals: A National Bibliography (1998) Covers publications from 1827 to 1990s
Antislavery Newspapers and Periodicals (1980) 5 vols.
Index to Black Newspapers (1984)
Newspaper Indexes: A Location and Subject Guide for Researchers (1977) 3 vols. - Lists newspapers by county and state, with date ranges and depository designation
Newspapers: A Reference Guide (1987) This finding aid has information on newspaper indexes
The Wellesley index to Victorian Periodicals, 1824-1900 (1966) 5 vols.