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Pseud Percy Verance

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Verance, Percy, pseud

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Perpetual Motion; Comprising A History Of The Efforts To Attain Self-motive Mechanism, With A Classified, Illustrated, Collection And Explanation Of The Devices Whereby It Has Been Sought And Why They Failed, And Comprising Also A Revision And Re-arrangem

Perpetual Motion; Comprising A History Of The Efforts To Attain Self-motive Mechanism, With A Classified, Illustrated, Collection And Explanation Of The Devices Whereby It Has Been Sought And Why They Failed, And Comprising Also A Revision And Re-arrangem