Even primarily textual books frequently contain images to illustrate a writer's arguments. Images may be interspersed amidst the text or presented as a group of "plates" in the middle of the book. It can be difficult to determine which books will contain valuable images for your research simply from a catalog record. The abbreviations "ill" or "facsims" will let you know that the book contains illustrations or facsimiles, but not what the images might depict or how many there might be. You will need to take a look at the books you find to determine for yourself whether they contain useful images.
When you do find useful images, take note of the artists, collections, or original publication sources for these images. You will often be able to find similar images by using this information to extend your search.
Sample LC Subjects include: