The problem is that the route from New Haven to Naugatuck (Routes 67 and 63 in 1938, just Route 63 today) has changed. The Guide speaks of a roadside millstone, a relic of "one of a few stone tanbark mills, powered by oxen, ever used in New England" in New Haven. It describes "pastureland fragrant with sweet fern, juniper, and bayberry." In Bethany, it promises an "aviation field" and a mink farm.
You probably did not need me to drive the 20 minutes, or however long it took, to tell you that those sights are either gone or very well concealed these days.
But when I got to the end, where Route 63 "continues past the factory lined Naugatuck River," I found...Naugatuck!
Because that sort of thing becomes amusing when you read about Connecticut too much.