Sotheby's. - Complete set of: European Historical Medals from the Collection of His Grace the Duke of Northumberland. Removed from Alnwick Castle. London, 3 December 1980. Card cover, 464 lots, 62 b&w plates. list of estimates and realized prices. European Historical Medals (Final Portion) from the Collection of His Grace the Duke of Northumberland. Removed from Alnwick Castle. London 17 June 1981. Card cover, 471 lots, 51 b&w plates. list of estimates. 2 catalogues, Complete set. Very good