Hi Lydia,
When Tpt_ goes over to Google in the summer, please pass on my info to him, to reach out to me about any questions the team may have about some of my /base's in Freebase. Many have found them useful, and the data comes mostly from government sources already.
I am sure that there are other Freebase Experts that would also encourage Tpt_ to reach out to them to help with any mappings that might be needed or questions answered.
Google's Freebase team knows the Freebase Commons quite well...but... when it comes to /base's that is when you'll need to involve the admins of those bases, which many were experts of Freebase such as myself, and easily reachable by email, etc.
Good notes from Denny and yourself in the chat. Like 'em!
All the best,
Thad +ThadGuidry https://www.google.com/+ThadGuidry