The ISBN of The Time Ships is 0-002-24609-0.
The ISBN of Ships of Merior is 978-0061052163.
The ISBN of They Came on Viking Ships is 9780207200113.
The ISBN of Black Ships Before Troy is 0-385-31069-2.
The ISBN of Angel Time is 9781400043538.
The ISBN of Dawn of Time is 0525666249.
The ISBN of The Masks of Time is 0345234464.
The ISBN of A Thief of Time is 9780061000041.
The ISBN of The Time We Have Taken is 0732278368.
The ISBN of Time Benders is 0440412145.
The ISBN of No Time For Goodbye is 978-0752893686.
The ISBN of Locked in Time is 978-0316195553.
The ISBN of Let Time Pass is 9788700475243.