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University of Kansas Medical Center -- Histology atlas with succinct explanations of the tissues to guide the first-year medical student in the use of their microscope (best viewed in FireFox)
University of Delaware -- Many color microscope images and black and white electron microscope images from a course that emphasizes human tissues and organ systems.
University of Pennsylvania -- Extensive collection of slides (with labels) for tissue types and organ systems. Images and magnified images load quickly.