• Scientific American 1915-01-30 1261 visits Scientific American 1915-01-30
  • Scientific American 1915-05-22 1485 visits Scientific American 1915-05-22
  • Scientific American 1915-05-29 1298 visits Scientific American 1915-05-29
  • Scientific American 1915-06-19 1265 visits Scientific American 1915-06-19
  • Scientific American 1915-06-26 1217 visits Scientific American 1915-06-26
  • Scientific American 1917-04-28 1424 visits Scientific American 1917-04-28
  • Scientific American 1917-07-14 1237 visits Scientific American 1917-07-14
  • Scientific American 1918-04-27 1589 visits Scientific American 1918-04-27
  • Scientific American 1918-06-01 1294 visits Scientific American 1918-06-01
  • Scientific American 1918-06-15 1442 visits Scientific American 1918-06-15
  • Scientific American 1918-06-22 1175 visits Scientific American 1918-06-22
  • Scientific American 1918-06-29 1324 visits Scientific American 1918-06-29