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      Scientific American May 2003

      Spotty Defense

      Big cities are late to vaccinate against smallpox

      • By Mark Alpert

      This is a preview. Make a selection below to access this issue.Already have access? Sign in.

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      More in the May 2003 issue of Scientific American
      • Pulling the Lever
      • Wired Superstrings
      • Math's Most Wanted
      View Full Contents
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