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Perfins

Burkhart BEER and Maurice HARP, Pilfering, Protection and Perfins: An Aspect of the Line-Engraved Twopence. Dusseldorf, Germany: Briefmarkenfreunde Dsseldorf, 1996.

Tony EDWARDS and B. C. LUCAS, G.B. Official Perfins. Northwood, Middlesex: The Perfin Society, 1984. 69pp.

Tony EDWARDS, The Tomkins Catalogue of Identified G.B. Perfins. 167pp.

Roy GAULT, The Perfin Society Catalogue of Sloper's Wartime Provisionals.

The Perfin Society Catalogue of G.B. Perfins - Illustrated Catalogue Updates 1993. The Perfin Society, 1993.

The Tomkins Catalogue of Identified G.B. Perfins, 7th edition. The Perfin Society, 1993.

Ian HAMILL and Roy GAULT, Great British Perfins found on King George V Seahorses 1913-1939, 2nd edition. Orpington: Perfin Society, 2017. 142pp.

Ian HAMILL, Kevin PARKHILL, Stephen STEERE and Roy GAULT, The Perfin Society Illustrated Handbook of GB Perfins - Hospital Dies. The Perfin Society, 1993. 28pp.

John S. NELSON, The Handbook of British Perfins, 1st edition. Westerham: John S. Nelson, 1967. 30pp.

The Handbook of British Perfins, 3rd edition. Northwood, Middlesex: Perfin Society, 1988. 30pp.

Catalogue of Perfins 1924-1925 British Empire Exhibition Stamps. The Perfin Society, 1993. 16pp.

Mary E. THORNTON, Catalogue of Official Perfins. Section 1, Great Britain. London: The Great Britain Philatelic Society, 1967. 16pp.