Revision History for USGS Open-File Report 79?1654

  R.L. Porcella and R.B. Matthiesen

  Preliminary Summary of the U.S. Geological Survey Strong-
  Motion Records from the October 15, 1979 Imperial Valley 
  Earthquake

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  Posted online at http://pubs.usgs.gov/of/1979/1654/
  August 31, 2001

  Initial release in paper form
  October 1979

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