To make your search most effective, put quotation marks around names and titles (search for "Alice Paul" and not Alice Paul.) As soon as you can in the search, narrow by dates so you can get true primary sources.
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These free online digital collections of newspapers can be helpful to see how your topic was being reported in the news, even if it's not the location where the person lived or the event took place. And remember: the date of publication is important.
The library has a number of books related to immigration in the United States, including this one:
