Clue: Speed-of-sound number

We have 2 answers for the clue Speed-of-sound number. See the results below.


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Last Seen In:

  • King Syndicate - Eugene Sheffer - September 12, 2012
  • Universal - July 06, 2007
  • Washington Post - December 12, 2006
  • USA Today - April 07, 2005
  • New York Times - July 20, 1999

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