The Library's Architecture books are shelved in an area called NA. Books have small labels on them that list their call number: a scheme to organize a library's collections. This scheme uses letters to represent ideas, e.g., B is Philosophy and Religion, N is Art, etc. The scheme uses single letters and double letters. NA represents Architecture, a subcategory of Art (N): all Architecture books have an NA call number. Books are shelved by their call number in alphabetic order, so the A books are the first books and the N and NA books are shelved in about the middle of the collection. Always feel free to ask a librarian if you need any help with anything, including finding books.
Library's Google Scholar LibGuide