Thanks to NELSAP reader Nan Williams, we now know of this ski area that operated in Charlemont. Here's what she has to say:
"One not listed was Mohawk Trail Skiers Project on the Mohawk Trail (Tea Street)...in Charlemont. Funny name but that's what they called it. It was in operation with a rope tow in 1938 when the ski trains came there. It did not last long (south facing slope!) but I don't know just how long."
There was one ski area in Charelmont in 1939 that operated at a "slalom area"...this could have been it.