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The sites listed below are very useful for finding images for reports and presentations. To be sure you actually have permission to use an image, it is important to search for images that are either in the public domain or that have an appropriate Creative Commons license.
Many Flickr users have chosen to offer their work under a Creative Commons license, and you can browse or search through content under each type of license.
Figshare is a web-based interface designed for academic research data management and research data dissemination. It accepts all file types (with in-browser viewing) and includes many images.
