The National Geophysical Data Center (NGDC) of the Environmental Data Service (EDS), NOAA, is now providing the following services: Conventional seismograms. Copies of current seismograms from the Canadian and NOAA networks in addition to copies of the seismograms from the World‐Wide Network of Standard Seismographs (WWNSS) and other foreign stations are now available.
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A 1972 study studied this question.