I have one of the very few extant copies of this book, and I'm willing to do lookups for the descendants of William Therrill of Massachusetts. But please -- no more than 5 names per request, with dates, places, and parents if you have them. This book was published in 1969, so there is no information after that date. I'd rather you send your requests to me at ksullivan@hvc.rr.com, but if you post to the board, I'll get around to it eventually.