It's simple, just go to Journals & Newspapers, type in the title of the newspaper and press return! If we have access to it via a database, the database name and dates of coverage will be listed.
Other libraries may have copies of other newspapers. You can use either search Worldcat or the Center for Research Libraries' catalog to see what might be available.
You can also find other digitized newspapers by using ICON: International Coalition on Newspapers Digitization Projects.