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The Hollow Earth - PDF Preview
The Hollow Earth
by F. T. Ives
A Crank that revolves only half way will not always accomplish much of a change, and in many cases would only aggravate the situation. Were it not for Cranks nearly all mechanical appliances would be motionless.IMPORTANT: This is just a preview of the first few pages. To read the whole book, please download the full eBook PDF.
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