Use these terms to help choose which collection to search and to do the search once you've chosen.
Search tip: use quotation marks around a phrase to keep words together.
These collections bring together sources from many institutions, so you can search materials from multiple places at once. Because they are multi-subject, you'll want to try keywords that reflect your focus (e.g., nuclear, atomic, "civil defense") to find relevant resources.
These databases have collections of newspapers published generally pre-1990, often digitized from print or microfilm. They are searchable, but be aware that the results won't be as accurate as born-digital newspapers.