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Image Research Guide: Image Resources: Science
A guide for finding and using images and where to get help.
2 million images of arts, humanities, science. Can search by terms such as "medicine," "science," "anatomy," "surgery," "botanical illustration," and many more.
Image databases of five federal agencies: NIX NASA Image Exchange, NOAA Photo Library, USDA Plant Image Gallery, USGS Multimedia Gallery and USGS-NBII Life.