Source: F.R. Macaulay, The Movements Of Interest Rates, Bond Yields, And Stock Prices In The United States Since 1856, (NBER No. 33, 1938), Table 13, Pp. A174-A176.
This NBER data series q13020 appears on the NBER website in Chapter 13 at http://www.nber.org/databases/macrohistory/contents/chapter13.html.
NBER Indicator: q13020
Release: NBER Macrohistory Database
National Bureau of Economic Research, Municipal Bond Yields for New England [Q13020USQ156NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/Q13020USQ156NNBR/, November 27, 2015.