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This is a follow up question to Archiving web content annually. One site or sites by year?

We are completing the import of tens of thousands scientific abstracts into a single site. The most recent two years of abstracts were hosted on separate domains (conference2012.org, conference2011.org) and represents around 3,000 pages.

I have the ability to add redirects to every single document on the smaller sites and redirect to the new, main site. However, I am uncertain if Google will slap a Panda, Penguin, or Farmer penalty on the new site for receiving so many redirects from two other domains. But if I don't redirect, I'm concerned that I'll get nailed by the duplicate content penalty before the old sites de-index.

How do I set up this type of migration?

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up vote 1 down vote accepted

Merging a small number of sites into one shouldn't be a problem.

In fact, Matt Cutts made a webmaster help video expressly for this situation: http://www.youtube.com/watch?v=l7M22teF3Ho

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