This website elephind.com searches several newspaper archives in one swipe. It searches over 3,400 newspaper titles from such archives as Columbia University, Library of Congress, National Library of Australia, Pennsylvania State University, and many more. You can search them all at one time or choose the specific archive you are interested in. The countries covered are the United States, Australia, Mexico, New Zealand, and Singapore.
Check it out at:
Elephind.com: Search the world's historic newspaper archives:
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