The Massachusetts Historical Society (MHS) is a major research library and manuscript repository. Its holdings encompass millions of rare and unique documents and artifacts vital to the study of American history, many of them irreplaceable national treasures. A few examples include correspondence between John and Abigail Adams, such as her famous remember the ladies" letter; several imprints of the Declaration of Independence; and the pen that Abraham Lincoln used to sign the Emancipation Proclamation." [self-description] The site of the Massachusetts Historical Society provides access to a searchable catalogue, information about the featured publications and general information about the society. Online exhibitions explore - amongst others - topics like "Battle of Bunker Hill", "Maps of the French and Indian War", "John Quincy Adams" and the "Adams Family Papers".