Working in the field of self-improvement since the 90s, I know thousands of books that claim to improve your state but don’t do much outside of the placebo-effect. The classic 1997 book “Colour Zone Therapy” by Joseph Corvo and Lilian Verner-Bonds is one of those rare books that delivers. It contains a list of ailments – back pain, influenza, poor eyesight, depression, insomnia, etc.
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