On page 133, fourth paragraph, it says that Hermione lent Harry Quidditch Through the Ages: "She had also lent him Quidditch Through the Ages, which turned out to be a very interesting read." On page 46 paragraph three of QTtA, it says "The most successful Japanese team, The Toyohashi Tengu, narrowly missed a win over Lithuania's Gorodok gargoyles in 1994." However, Harry borrows QTtA in Book 1 which is set in 1991.

WOA!! It really is "Quidditch THROUGH THE AGES!!" :)