Visual Sources
Visual materials, i.e., drawings, paintings, prints, photographs, films, videos, etc. are to be found in many Harvard libraries. Records for many, but by no means all, individual Harvard University Library images are available in VIA, an online catalog of images. Records include subjects and a thumbnail image.
Science & Society Picture Library contains over 50,000 images from the Science Museum (London), the National Museum of Photography, Film & Television and the National Railway Museum.