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Nancy Drew 27: The Deadly Device Hints
"1893 Columbian Expo site"
1 of 3: You'll find a reference to this in the book "Battle of the Currents," which is on top of the 3D printer (to the right of the door as you enter the lab).
2 of 3: On the second page, it says that Tesla used AC to illuminate the 1893 Columbian Exposition, which was located on the Chicago fairgrounds. So the book you want is --
