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Natural sources of power (1908) : Ball, Robert Steele - Free Download & Streaming : Internet Archive - https://archive.org/details/naturalsourcesp00ballgoog
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Author: Ball, Robert Steele Subject: Water-power; Windmills Publisher: New York, D. Van Nostrand company Year: 1908 Possible copyright status: NOT_IN_COPYRIGHT Language: English Digitizing sponsor: Google Book from the collections of: University of Michigan Collection: americana ‎- silpol