To find books, e-books and exhibition catalogues in the library, you'll need to use Library Search. Library Search enables you to search the library catalogue and also other resources (e.g. journal articles and theses) - you can search by keyword (topic, gallery name, etc.), author or title.
Some publishers/organisations make their books and other publications open access (OA), which means that you can read and/or download them online for free. The following organisations are worth looking at for OA publications in the fields of Art History, Curating and Heritage: