Well, the title says it all. I recently found this source, but it needs registration and all that. Is there a source of newspapers from the 18th and 19th century?
I'm on mobile, but a few years ago the Library of Congress had a national program to digitise old newspapers as an effort to preserve us history. For the life of me I can't recall it's name, but maybe Google could help you search their site?
(Source: I used to work at a University library that got a grant to digitise our states papers)