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I need to find an article or something with factual findings that shows Google no longer gives extra value to .com, .net, .us, edu. etc. or proving that is still does.

I have a site that is currently set up geo-targeted in sub-domains.  So each geo is princeton.site.com.  Each site has the same code, design, but the events listed are different.  There are about 30 subdomains and they are  looking to expand nationally. After the Panda update, I am seeing that it looks like they should stay as sub-domains rather than redirecting everything or setting up new domains. Any thoughts on if the sub domains should stay and expand exponentially? SEO strategy, etc.? I'm also worried about the possibility of duplicate content. Thanks!