- Scientific American 1921-05-21 1286 visits
- Scientific American 1921-05-28 1367 visits
- Scientific American 1921-06-04 1200 visits
- Scientific American 1921-06-11 1230 visits
- Scientific American 1921-06-18 1342 visits
- Scientific American 1921-06-25 1382 visits
- Scientific American 1921-07-09 1356 visits
- Scientific American 1921-07-16 1151 visits
- Scientific American 1921-07-30 1168 visits
- Scientific American 1921-08-06 1248 visits
- Scientific American 1921-08-13 1367 visits
- Scientific American 1921-09-10 1315 visits
- Scientific American 1921-09-17 1424 visits
- Scientific American 1921-09-24 1298 visits
- Scientific American 1921-10-01 1307 visits
- Scientific American 1921-10-08 1287 visits
- Scientific American 1921-11 1311 visits
- Scientific American 1922-03 1616 visits
- Scientific American 1922-06 1408 visits
- Scientific American 1922-08 1365 visits
- Scientific American 1923-10 1483 visits
- Scientific American 1923-11 1560 visits
- Scientific American 1923-12 1249 visits
- Scientific American 1924-01 1496 visits
- Scientific American 1924-05 1683 visits
- Scientific American 1924-07 1504 visits
- Scientific American 1924-08 1427 visits
- Scientific American 1924-10 1641 visits
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- Scientific American 1925-01 1824 visits
- Scientific American 1925-03 1148 visits
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- Scientific American 1926-07 1419 visits
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- Scientific American 1926-09 1581 visits
- Scientific American 1926-10 1862 visits
- Scientific American 1926-11 1569 visits
- Scientific American 1926-12 1496 visits
- Scientific American 1927-04 1768 visits
- Scientific American 1927-09 1577 visits
- Scientific American 1927-10 1278 visits
- Scientific American 1928-07 1228 visits
- Scientific American 1928-09 1546 visits
- Scientific American 1928-10 2052 visits
- Scientific American 1928-11 1174 visits
- Scientific American 1929-02 1606 visits
- Scientific American 1929-06 1758 visits
- Scientific American 1929-08 1735 visits
- Scientific American 1930-01 1897 visits
- Scientific American 1930-02 1985 visits
- Scientific American 1930-04 1989 visits
- Scientific American 1930-08 1903 visits
- Scientific American 1930-11 2073 visits
- Scientific American 1930-12 2129 visits
- Scientific American 1931-04 2093 visits
- Scientific American 1931-06 5355 visits