Royal Commission on Historical Manuscripts

The Royal Commission on Historical Manuscripts (widely known as the Historical Manuscripts Commission, and abbreviated as the HMC to distinguish it from the Royal Commission on the Historical Monuments of England), was a United Kingdom Royal Commission established in 1869 to survey and report on privately owned and privately held archival records of general historical interest. Its brief was "to make inquiry as to the places in which such Manuscripts and Papers were deposited", and to report on their contents.

Source: Wikipedia — Royal Commission on Historical Manuscripts (CC BY-SA 4.0)