Thanks for the birthday wish, September!
I know Henniker very well...lived in Nashua before moving to Florida. Graduated from UMass (Amherst then Boston); actually lived in New England for 27 years. The world gets smaller every day.
Although the bulk of my research is the Stiles family from New England, I do have information about the Sampson family as they are "intertwined" in NH, and MA. I will gladly share what I have!
My direct line is John Martin b. abt. 1763 in Hanover, Grafton County, New Hampshire & Eunice Jennison b. about 1769 in Dorchester, Suffolk County, Massachusetts. That is where I stop on my Martins so far. Other lines do better.
I used to live in Quechee, VT. I used to go to auctions in Plainfield and at one auction, items from George Colby's estate came up. I bid on and won his journals. They run from 1900 to 1946. I don't have all of them. They are interesting. He was into genealogy and was a contributer to the big Hardy / Hardee genealogy. One of these days I am going to transcribe the journals. I always wanted to be a procrastinator but never got around to it. Henniker does have a historical society.