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Assignment: choose a historical image from Wellcome Images, an important trove of images on the history of medicine. Compare with other images from class or of relevance to your topic http://welcomeimages.org
Create an account: more options for saving and comparing images, downloading multiple images, etc.
Search: Choose "Historical" [i.e. free] / advanced search option possible
Explore: browse images on themes, if you arene't sure where to start: