There are two books on Vermont. The older one is paperback, titled GUNSMITHS AND GUNMAKERS OF VERMONT , by Warren R. Horn. It was published in 1975. and has 75 pages. The second book is VERMONT'S GUNSMITHS & GUNMAKERS TO 1900, by Harry Phillips & Terry Tyler, published in 2000. It is 306 pages, hardbound, and is excellent. Unfortunately it is out of print and hard to find.
There is also RHODE ISLAND ARMS MAKERS & GUNSMITHS, 1643 - 1883, by William O. Achtermier, published in 1980. It is 108 pages, hardbound.