Several pages on the web offer their public domain images in a long list. To avoid checking these lists again and again for matching wikipedia articles, here's a list of specific images with missing articles. If you see that one of these articles exists, please add the image from the external link, and remove it from this list.

• List of PD images from lib.utexas.edu (not uploaded yet) — Done.
• Wikipedia:Portraits from the Dibner Library of the History of Science and Technology, in the public domain by age

• For lists of missing articles by other criteria, see also Wikipedia:Requested articles.