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      Digital & 4-Year Archive

      Scientific American September 1975

      The Amateur Scientist, September 1975

      Electronic stratagems are the key-to making a sensitive seismometer

      • By C. L. Stong on September 1, 1975

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      More in the September 1975 issue of Scientific American
      • Jupiter
      • The Authors, September 1975
      • The Origin and Evolution of the Solar System
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