1. Philatelic 20/1/1 Reference (shelfmark): Philatelic 20/1/1 Title: Ewen Collection: Aylesbury and Buckinghamshire Railway Scope & Content: Railway letter stamps, covers and related material, provenance records and notes relating to the Aylesbury and Buckinghamshire Railway. Collection Area: Philatelic Collections Languages: English Date Range: 1891-1912 Extent: Section within volume.