Entered at the Post Office of New York N. Y. as Second Class matter. Copyrighted 1892 by Mann At Co. Vol. LXVII No. , scientific american, 1892-09-17
Entered at the Post Office of New York N. Y. as Second Class matter. Copyrighted 1892 by Mann At Co. Vol. LXVII No. , scientific american, 1892-09-17
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