Google not Indexing Certain URL pattern... why?

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http://serverfault.com – On one part of our site we have a section with a bunch of url's formatted like so: http://mysite.com/section-name/?feed_id=1334 They are a list of a dozen individual links that are presented like: <a href="http://mysite.com/section-name/?feed_id=1334">Article Title of Some Sort</a> <a href="http://mysite.com/section-name/?feed_id=1333">Different Title</a> I can see Google's bot hitting http://mysite.com/section-name/ but it never indexes the various articles (it's been 6 months). Why would this be? Each link leads to a page that displays a complete, unique, artic (HowTos)