They were series opener Harry Potter and the Philosopher's Stone in 2001, fourth instalment Harry Potter and theGobletofFire in 2005 and the fifth entry, Harry Potter and the Order ofthe Phoenix, in 2007.
After Wilson's Tracy Beaker, JK Rowling's Harry Potter and the Prisoner Of Azkaban was the most borrowed title, followed by the Potter titles Chamber Of Secrets and GobletOfFire.