I have a copy of the "History of Billerica, MA." In case it will help anyone, there was a Clark family listed. Joseph and Rebecca (Fuller) Clark m. 1795. They had 2 daughters; Elizabeth m.1803, Polly m.1803. I am searching for a James Clark who had a daughter, Mary Clark, in early 1800's in MA/RT/CT area. Mary Clark m. John Dexter.