For a number of years the publishers of SCIENTIFIC AMERICAN also published a SUPPLEMENT, which carried longer articles on specific topics.

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Scientific American Supplement 1878 Volume VI Title
1888 visits
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Scientific American Supplement 1878-12-28
1453 visits
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Scientific American Supplement 1898-10-29
1377 visits
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Scientific American Supplement 1900-12-22
1748 visits
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Scientific American Supplement 1900-12-22a
1304 visits
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Scientific American Supplement 1902-01-25
1197 visits
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Scientific American Supplement 1902-11-15
1386 visits