State Library of Massachusetts

The State Library of Massachusetts (est.1826) in Boston, Massachusetts, "supports the research and information needs of government, libraries, and people through ... services and access to a comprehensive repository of state documents and other historical items." It "opened in 1826 and has been in its present location in the State House since the 1890s." The State Library falls under the administration of the governor.

More information on the Wikipedia page.

The website is.