During the 1980s the Tucson Weekly nicknamed Tucson the "Baked Apple" and has used that nickname in many articles over the years. The nickname is in reference to New York City's nickname, the Big Apple.
Source:
6 Tucson Nicknames and the History Behind Them | Source: Destguides.com
Find the information you need by calling the library's Infoline at 520-791-4010 or by sending your question to Ask a Librarian.