New York: The Master Key Institute,1919.

Extremely Rare Complete Set in Seven Volumes.Very good overall condition for age. Green leatherette binding, stamped in gilt, faded on several volumes. Chipping of top and bottom spines on all volumes and missing FFE of volume 1,2 and 5. Pencil marks on FFE of volume 3. Volumes 1,2,3 and 5 have cracked front hinge. Pages are tanned as consistent with age. ( Please see photos for condition, more available on request)

This complete set of The Master Key System by Charles F. Haanel is a rare find. Published in 1919, this 7-volume set is a valuable addition to any collection and a must-read for those interested in personal development and success. Long a Silicon Valley secret, read by many successful entrepreneurs. Each volume contains insights and exercises that aim to unlock the reader's potential and reveal the secrets to success.The books are in good condition and have been well-preserved over the years. They are a valuable piece of history and offer timeless wisdom that is still relevant today. With its beautiful antique design and fascinating content, this set is a true gem that will be treasured by its new owner.

From Wikipedia:

The Master Key System is a personal development book by Charles F. Haanel that was originally published as a 24-week correspondence course in 1912, and then in book form in 1916.[1] The ideas it describes and explains come mostly from New Thought philosophy. It was one of the main sources of inspiration for Rhonda Byrne's film and book The Secret (2006).

The book describes many New Thought beliefs such as the law of attraction,[2] creative visualization and man's unity with God, and teaches the importance of truth, harmonious thinking and the ability to concentrate.[3][4] Each of the 24 chapters contains an introduction, followed by a sequentially numbered section which includes an exercise towards the end, followed by a section with questions and answers. At the beginning of the book is a Psychological Chart which readers are encouraged to complete, providing a self-evaluation of their creative power, time efficiency, health, mental ability and capacity to concentrate.[5]