source list

1923 ALA Automobile Green book
1930/31 ALA Automobile Green book
1933 Socony New England
1936 Rand McNally MA
1939 Shell CT-MA-RI
1942 Amoco New England
1946 Texaco New England
1950 Gulf New England
1950 Shell CT-MA-RI
1950 Mobilgas New England
1953/54 AAA New England
1956 Sinclair CT-MA-RI
1957/58 New England Hotel Association
1957 Mass Turnpike
1958 Sunoco CT-MA-RI
1959 Shell MA-CT-RI
1961 Gulf New England
1962 Montgomery Ward atlas
1964 Hammond atlas
1965 Rand McNally atlas
1966 Texaco CT-MA-RI
1967 National Survey New England
1968 American Boston
1969/70 Sunoco CT-MA-RI
1969/70 Official MA map
1971 Shell CT-MA-RI
1971/72 Sunoco CT-MA-RI
1971 AAA CT-MA-RI
1972 Hess MA-CT-RI
1972 AAA CT-MA-RI
1974 AAA CT-MA-RI
1975 AAA CT-MA-RI
1975/76 Official MA map
1977 AAA CT-MA-RI
1978 Rand McNally atlas
1979/80 Official MA map
1981 Reader Digest Eastern US atlas
1981 Rand McNally atlas
1983 Inkeeper’s Map of New England
1983 Rand McNally atlas
1984 Rand McNally atlas
1986 Stop & Shop New England
1989 Rand McNally atlas
1990(?) AAA atlas
1995 AAA Boston
1996(?) AAA atlas
1998 AAA Boston
1998 National Geographic atlas
1999 Official MA map
2000 National Geographic Atlas
2001 National Geographic Atlas
2001 Citizen’s Bank Boston
2002 Official MA map

Data from the Massachusetts GIS Office was also used to compile the list of towns without routes and many of the multiplexes.