Claire reads Rick Romer's Vision of Astrology in the episodes "Confidence Man" and "Left Behind".
The book in the episode "Confidence Man".
This book seems to be a meta-fictional book prop, created for use in the Lost universe. The book's author is the name of one of the set decorators, Rick Romer. Romer's last episode on Lost was "Exposé", the episode previous to when the book appeared on the show.