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You really really need to correspond with, talk to, etc. Michael LeClerc of the Society staff on this type of Quebec name/issue. After all, they may very well have been Kingsburys who went from NE to Quebec on their own (or under duress!) a century or two before. Part of this is to identify if they were Catholic converts and so pass through the Society's collection of Quebec records, where they can be found.
As David is to the DEARBORNS, Michael is to QUEBEC.
Thank you for the reply but according to Ken Kingsbury, my Kingsburys did actually come from Canada to Maine. No NE connection, unfortunately, that would have been so much easier.
Have the Dearborns done though. If you need any info I do have quite a bit.