If you have ancestors from Ontario, Canada, this site may be of interest to you. But beware. Once you get into it, you will be occupied for hours because of all the valuable links it has.
From the landing page you have options to explore newspapers by community or by title, You also have the option to do a search using a tab in the upper right of the page. To the right of the page is a link to additional Ontario papers as well.
Check it out at: OurOntario.ca: Newspaper Indexes:
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