Books are important resources for many photography topics. Finding books on specific photographers or photos can be difficult because subject headings are often broad. For instance, a book such as American Photography, 1890-1965, From the Museum of Modern Art, New York by Peter Galassi is likely to discuss a large number of photographers, though they won't be named individually in the library catalog. Nevertheless, the catalog record offers several clues to a book's potential relevance: the title keywords, the length of the book, and the assigned subject headings.
As you search, keep in mind that the catalog records for books are brief. If you are seeking books that will contain lots of images, look for titles with "exhibition catalogue" or "catalogue raisonne" as part of the description.