Tenth Planet: Revelations from the Astrological Eris, Paperback/Henry Seltzer

This book has been several years in the writing; Henry Seltzer has left very few stones unturned in his quest to understand how the archetypal Eris shows itself in a wide variety of charts. This treasure trove includes lots of case histories as well as chapters on Eris through the houses and in aspect with other planets.