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
1892 visits
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Scientific American Supplement 1878-12-28
1458 visits
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Scientific American Supplement 1898-10-29
1387 visits
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Scientific American Supplement 1900-12-22
1749 visits
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Scientific American Supplement 1900-12-22a
1305 visits
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Scientific American Supplement 1902-01-25
1198 visits
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Scientific American Supplement 1902-11-15
1391 visits