at the Post Office of New York N. Y. as Second Class matter. Copyruthted 1892 by Munn Co. r$ A YEAR. WEEKLY. Vol. LXVIINo. , scientific american, 1892-10-01
at the Post Office of New York N. Y. as Second Class matter. Copyruthted 1892 by Munn Co. r$ A YEAR. WEEKLY. Vol. LXVIINo. , scientific american, 1892-10-01
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