Have you a strong will? or, How to develop and strengthen will-power, memory, or any other faculty or attribute of the mind, by the easy process of self-hypnotism / by Charles Godfrey Leland.

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Have you a strong will? or, How to develop and strengthen will-power, memory, or any other faculty or attribute of the mind, by the easy process of self-hypnotism / by Charles Godfrey Leland. In copyright. Source: Wellcome Collection.