1. 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