If you want to browse the shelves for books about the Aztecs or the library catalog using a call number search, use the following Library of Congress Classification call number ranges:
F1213-1219 (Mexico/Antiquities). Most of the books on Aztecs are in the F1219 call number on the 6th Floor.
N6503, 6550 (Art/Mexico/Aztec) on the 5th Floor.
NA750s (Architecture/Mexico/Aztec) on the 5th Floor.