Series Number Id: GSGS 2742; Sheet number: 36a SE; Edition number: 8a, Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC10; envelope_number: 280, Manuscript on cover: 2/Lt J.W. Penniman [? 250th Tunneling Coy RE?]. MS on face: various marking relating to British advance - boundaries, crater, pillbox, with map refs.
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