PRELUDE: The Expanding Seas of Earth – may now be purchased on at AMAZON.COM and the iBOOK STORE.

https://www.amazon.com/Prelude-Expanding-J-H-Tabbott-ebook/dp/B07GGGMY13/ref=sr_1_1?keywords=tabbott&qid=1551288944&s=gateway&sr=8-1