Massachusetts Libraries - Directory of library websites includes state, public and academic. - http://www.librarysites.info/states/ma.htm
State Library of Massachusetts - Includes information on genealogy, legislative history, special collections, and legal research resources. - http://www.mass.gov/lib/
Berkshire Athenaeum Library Catalog - Collection offers histories for nearly every town in the Commonwealth, with a focus on the Berkshires and western Massachusetts. - http://www.berkshire.net/PittsfieldLibrary/search.html
Northeast Massachusetts Regional Library System - Community of academic, public, school and special libraries and media centers which collaborates to share resources. - http://www.nmrls.org/
Boston Library Consortium - Cooperative association of sixteen academic and research libraries which supports resource sharing and enhancement of services through programs. - http://www.blc.org/
Massachusetts Library and Information Network (MLIN) - Gateway to information about libraries in Massachusetts, including detailed directory information, library homepages and special services. - http://mlin.lib.ma.us/