"Printing Coy. R E, W.O.B./1359". Detail and Lambert grid black; contours brown; water blue. One of very few British maps to carry the Lambert grid. Back-area survey on Lambert projection with Lambert grid. Printed in the later part of 1918. Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC17; envelope_number: 524
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