The Smithsonian has released more than 2.8 million images you can use for free
The Smithsonian Institution is releasing 2.8 million high-res images from its massive collection into the public domain, putting them online for anyone to use and download for free.
from https://www.theverge.com/2020/2/25/21153208/smithsonian-institution-museums-free-images-libraries-dc
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