Boston Public Library
Boston's Municipal Register

Online Collections

Boston's Municipal Register: Containing Rules and Orders of the City Council, the City Charter and Recent Ordinances, and a List of Officers of the City of Boston

The Municipal Registers provide an excellent insight into the workings of Boston government for a time period.  The exact contents change from time to time.  At one point, they offered election results.  At other times, city maps were included (available here)