- Series: Creating True Wealth
- Paperback: 286 pages
- Publisher: CreateSpace Independent Publishing Platform; 1 edition (April 7, 2016)
- Language: English
- ISBN-13: 9781585426270
- Product Dimensions: 7 x 0.4 x 10 inches
A MUST OWN! The Master Key System is a personal development book by Charles F. Haanel that was originally published as a correspondence course in 1912. Though originally a 24 week correspondence course, it was published in book form in 1916. It was first published as a book in 1916 by Psychology Publishing, St. Louis and The Master Key Institute, New York.
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