The History of Eora, Volume VII: The Three Body Agreement

 is a book and quest item in.

Quest

 * Put on its lectern in the northwestern part of the Restricted Section. Activate the device to open the door leading to the western stairs to the Central Stacks.
 * Correct lectern (1st on the left): "The two took land and soldiers from the one, and they both gave everything in return."
 * The books needed are History of Eora volumes V, VII, IX and X.