for six months. All Letters must be Post Paid and directed t MUNN & CO. INDUCEMENTS FOR CLUBBING. Any person who will send us four subscribers for six months at our regular rates shall be entitled to one copy for the same length of time ; or we subscriptions. PREMIUM. Any person sending us three subscribers will tie en titled to a Dopy of the 'History of Propellers and Steam Navigation' re-published in book form—hav one of the most complete works upon the subject price 75 cents., scientific american, 1851-08-16

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for six months. All Letters must be Post Paid and directed t MUNN & CO. INDUCEMENTS FOR CLUBBING. Any person who will send us four subscribers for six months at our regular rates shall be entitled to one copy for the same length of time ; or we subscriptions. PREMIUM. Any person sending us three subscribers will tie en titled to a Dopy of the 'History of Propellers and Steam Navigation' re-published in book form—hav one of the most complete works upon the subject price 75 cents., scientific american, 1851-08-16

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