I just got back from New Hampshire and Maine a couple of weeks ago and the scenery is breathtaking, but the knappable rock, although there is no shortage of rock, is as far as I can tell non-existant.  I went to the New Hampshire Museum in Concord and most of the stone tools were very crudely knapped specimens due to the poor material.  I suspect the better lookig specimens were made of imported rock.  Really enjoyed the museum.  It is a good stop for anybody visiting the area.  My wife's family are all New Englanders, so I go up at least once a year.  I'm  already looking forward to my next trip.