Thresholds of the Mind is a 2003 trade paperback textbook written by Bill Harris. The book is titled "9 Principles for Conscious Living" and is aimed at adult and further education levels. The book is published by Centerpointe Research Institute and is written in English. The dimensions of the book are 7.5 inches in length and 5.5 inches in width, with a height of 0.5 inches.
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