1. Philatelic 20/20 Reference (shelfmark): Philatelic 20/20 Title: Ewen Collection: Railway Letter Stamps, M Scope & Content: This volume contains stamps, covers, related materials and provenance papers concerning the Metropolitan and District Railway. Collection Area: Philatelic Collections Languages: English Date Range: 1891-1912 Extent: 1 Volume
2. Philatelic 20/20/1 Reference (shelfmark): Philatelic 20/20/1 Title: Ewen Collection: Metropolitan and District Railway Scope & Content: Railway letter stamps, covers and related material, provenance records and notes relating to the Metropolitan and District Railway. Collection Area: Philatelic Collections Languages: English Date Range: 1891-1912 Extent: Section within volume.