Massachusetts has a law similar to what is known on the federal level as a Freedom of Information Act request (FOIA). In Massachusetts you may file what is called a Public Document Request of any public agency. It is often best to address the request to the Legal Counsel.
The agency has 10 calendar days to either product the documents, tell you that they are working on the request, or deny you request. The agency can charge for search time and copying costs.
If your request is denied you may appeal to the Supervisor of Public Records in the Secretary of State’s Office. This guide answers more questions.
http://www.sec.state.ma.us/pre/prepdf/guide.pdf