OX

From Author Wars - https://authorwars.com/publications/ox-394149.html

Overview:

Title: OX
Author: Piers Anthony
Year: 1986
Publisher: OPTA
Pages: 421
Binding: Hardcover
Type: Novel
Title Reference: OX
Notes: Probable first printing (DL = 1st trimester 1986. Numbered and limited printing of 1500+30 copies. No price on book. As usual, ISBN given on book is wrong (it should end with -5). Uncredited map on page 421.