In addition to the above aggregators of Creative Commons-licensed images, you can also consider searching the image collections of numerous institutions that make their images available for free use. The following links are just a snapshot of what is available. Note: Many of the examples below are skewed towards historical artifacts.
In Google images, click on "Tools" and then "Usage Rights." Then select "Creative Commons licenses." This will search for images that match this license, primarily drawing from Wikimedia Commons and Flick Creative Commons.
Questions? Contact firstname.lastname@example.org
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