This includes the Rugrats Chapter Books#1,#2,#3 and a bonus book. Book 1 is “The Perfect Formula” (ISBN 0439115493). First Scholastic Printing, September 1999. Book 2 is “Tommy’s Last Stand” (ISBN 0439115469). First Scholastic Printing, October 1999. Book 3 is “Star Spangled Babies” (ISBN 0439165113). First Scholastic Printing, January 2000. Book 4 is “Tommy Catches a Cold” (ISBN 0439061296). First Scholastic Printing, February 1999. These books are in great shape and getting hard to find.