1. Blackburn Coll 2 Reference (shelfmark): Blackburn Coll 2 Title: The Blackburn Collection of Oviedo Censor Marks Collection Area: Philatelic Collections Languages: Spanish Date Range: 1937-1943 Extent: 180 Items
2. Blackburn Coll 2/4 Reference (shelfmark): Blackburn Coll 2/4 Title: The Blackburn Collection of Oviedo Censor Marks Scope & Content: Registered cover dated 1st November 1939, from Las Arriondas with a Heller (2000 Ed) A134.1 type censor mark. Collection Area: Philatelic Collections Languages: English and Spanish Date Range: 1 Nov 1939 Extent: 1 Page; 1 Item
3. Blackburn Coll 2/5 Reference (shelfmark): Blackburn Coll 2/5 Title: The Blackburn Collection of Oviedo Censor Marks Scope & Content: Cover dated 14th October 1939 from Las Arriondas with a Heller (2000 Ed) A134.1 type censor mark. Collection Area: Philatelic Collections Languages: English and Spanish Date Range: 14 Oct 1939 Extent: 1 Page; 1 Item
4. Blackburn Coll 2/3 Reference (shelfmark): Blackburn Coll 2/3 Title: The Blackburn Collection of Oviedo Censor Marks Scope & Content: Cover of unknown date from Las Arriondas with a Heller (2000 Ed) A134.2 type censor mark. Collection Area: Philatelic Collections Languages: English and Spanish Date Range: 1936-1939 Extent: 1 Page; 1 Item