United States. Bureau of Economic Analysis. "Region 1 : New England, Volume 4" in 1980 OBERS BEA Regional Projections : Economic Activity in the United States by State, Economic Area, SMSA and State Portions of the Areas, Historical and Projected, 1969-2030 (July 1981). https://fraser.stlouisfed.org/title/9324/item/682150, accessed on January 17, 2026.