Okay, so I'm tracking through my Smith family and found a bit of a snag. My roadblock has to do with the wife of Reverend Thomas Smith of Falmouth (now Portland), Maine (still working on his profile, but his son is here:
http://www.wikitree.com/wiki/Smith-67471.
I have several secondary sources (who may all be quoting each other) that indicate that Reverend Smith's wife was Sarah Tyng (one says Susan Tyng). These sources all agree that Sarah (or Susan) was the daughter of a William Tyng. Some of the sources say it was Major William Tyng, son of Col Jonathan Tyng:
http://www.wikitree.com/wiki/Tyng-11, who appears to have lived most of his life in Dunstable/Tyngsborough, whereas the other sources refer to "William Tyng, Esq. of Woburn." With Woburn being far enought away from Dunstable that I'm uncomfortable with this discrepancy.
Anyone have any insight or access to sources that might help?