The Master Key
From Wikipedia, the free encyclopedia
The Master Key can refer to the following:
- The Master Key (1901 book), a 1901 children's book by L. Frank Baum
- Two film serials made by Universal Studios
- The Master Key (1914 serial), a 1914 film
- The Master Key (1945 serial), a 1945 film
- Otheruses
- The Master Key System, a personal development book by Charles F. Haanel
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