Briefly from the website itself:
"Aquifer American Social History Online - Find and use 19th and 20th century primary resources from unique historical digital collections. * search diverse digital content from 175 American Social History research collections * find more than 514,708 digitized objects in 9 formats, including images (photographs and cultural materials), books and pamphlets, journal articles, maps, sheet music, videos, data sets, political cartoons and posters, and oral histories."
I have not fully explored this site but it seems to be one worth mentioning and bookmarking. The browsing shortcuts to the right offer sections for time periods, places and subjects. The material would be useful for local research and general historical interest.
The legend of 3M's invisible electrostatic wall
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[image: Winding unit of extrusion plastic film blowing machine ; close up.
Copyright (c) 2019 Mr.1/Shutterstock. No use without permission.]
Giant polyprop...
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