Those are interesting totals...when I made my map years ago, there was a thin stripe of <=18" totals down the Housatonic Valley. I think Lanesboro had 18" and Great Barrington had 13". I never did find a Pittsfield number as they stopped reporting snow in 1970 at their site. I would suspect Pittsfield did ok since they are above 1,000 feet, but 30 inches would surprise me a bit. The Stockbridge coop discontinued in 1985 and Adams in 1978, so unfortunately nothing official there.
The Kocin Book has what looks to be 13" in AQW, but can't say for sure that is where the number comes from since it isn't labeled on those maps. He does have a couple 48" amounts on what looks like the spine of the Berkshires...I never found those totals (best I found was 44.5"), but they are probably pretty accurate given what we know about that storm.