The website for the International Coalition on Newspapers (ICON) may point you to digitization projects concerning newspapers that you would want to reference in your research.
The landing page allows you to select projects by country and by US State. The end of the line may not always give you to digital copies you want, but many of the link will do just that. This is a site with a very broad scope, so take some time to fully explore what it has to offer.
ICON - International Coalition on Newspapers:
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