Use the Books & Media tab on the Library homepage to search for books.
You can also search across all of the Five Colleges, and use the Request Item feature to have something delivered to Amherst.
A note on searching for exhibition catalogs:
Almost all Five College Library catalog records for exhibition catalogs contain the word "exhibitions," either as a subject term, or in the description. To find a catalog focused on a specific artist or topic, perform a keyword search that includes the artist's name (last name is often enough) or the topic word(s), and the word exhibition* (using the truncation symbol * searches for both the word exhibition and the subject term exhibitions).
Symbolism in Art
Decoration and ornament -- Africa
Yoruba (African people) -- Folklore.
Signs and symbols -- Africa, Sub-Saharan
Ceremonial objects -- Africa, Sub-Saharan
Arts, Black -- Nigeria -- Exhibitions [insert relevant country]
Arts and society -- Africa, West [insert relevant country]
Art and religion -- Africa, Sub-Saharan [insert relevant country or region]
Igbo (African People) [insert relevant group]
Artists--nigeria--biography [insert relevant country]
Modernism (Art) -- Nigeria
Scarification (Body marking) -- Africa
Tattooing -- Africa
Body painting -- Africa
And don't forget to use the subject headings from books you've already found!