In general, most of the art- and museum-related books at the AFA Library are classified using the Library of Congress classification scheme of N through NX.
Book call numbers starting AM through N are on the library's main floor:
|AM1-501||Museums, collectors and collecting|
Followed by call numbers NA through Z on the upstairs mezzannine:
|NC1-1940||Drawing, design, illustration|
|NX1-820||Arts in general (theory)|