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You may safely and easily purchase the book here:
English edition:
https://www.createspace.com/3546269
Spanish edition:
https://www.createspace.com/3824902
Kindle English e-book edition:
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Ddigital-text&field-keywords=potensia | 
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