A large number of the library's atlases are part of the reference collection located on the first floor. The bigger atlases are shelved along the wall at the end of the reference section furthest from the front entrance. A sizeable number of smaller atlases are shelved with the other reference books. Many of these have Library of Congress numbers beginning with the letter G.
You may have a better chance of finding what you need by searching the library's catalog before you browse the shelves. Try adding some of the phrases listed below to searches in ALEX.
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