ARTstor is a collection of image collections, and one of the outstanding collections within ARTstor is the Erich Lessing Culture and Fine Arts Archive. Lessing’s 4×5″ and 8×10″ color transparencies are being scanned to create this collection. These transparencies provide large digital files with a density of information that far surpasses what can be found in 35mm slides, which means that you can create incredible details for teaching (the image in this post is a small detail from one of his photographs). Add his name as a keyword when searching in ARTstor to see if any of his images may cover your topic of interest. So far, 81% of 13,000 images have been added to ARTstor, so more will be coming.