The ISBN of With the Old Breed is 0195067142.
The ISBN of A Breed of Heroes is 0340263342.
The ISBN of Old Mortality is 9780199555307.
The ISBN of Two Old Women is 9780704344242.
The ISBN of The Secret in the Old Attic is 0448095211.
The ISBN of Old Telly Time is 0949688037.
The ISBN of The Clue in the Old Album is 0448095246.
The ISBN of Old Man Logan is 0785131590.
The ISBN of Flight of the Old Dog is 978-1556110344.
Ten in the old ISBN, thirteen in the new ISBN's
The ISBN of "The Secret of the Old Clock" by Carolyn Keene is 978-0448095019.
The ISBN of The Secret of the Old Mill is 0-448-08903-3.
The ISBN of Old Angel Midnight is 0-91-251697-6.