Series Number Id: GSGS 2742; Sheet number: 36 SW + 36 NW (parts); Edition number: 11a, Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC08; envelope_number: 222, Manuscript on Cover: IWP [?2/Lt J.W. Penniman] [? 250th Tunneling Coy RE ?]; Manuscript of Face: markings for final advance - Army, Corps and Divisional boundaries, boundaries for No. 1, 2 & 3 Sections [250th Tunneling Coy RE], Anti- tank mine fields, Craters, Dugouts, Concrete Dugouts and Penthouses in old front line.
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