Yep, the Newberry has it. Really; I'm not kidding!
Thanks to an "Anonymous" tip, I learned that the Bruce Roberts 1931 "Map of Chicago's gangland from authentic sources: designed to inculcate the most important principles of piety and virtue in young persons, and graphically portray the evils and sin of large cities" can be purchased from the Newberry Library Poster shop for $14.95 plus shipping. Knock three times, you'ze mugs, and tell them the Journal sent ya. Sing a Song of Gangsters A Pocket Full of Dough Four and Twenty Bottles Make a Case You Know