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File:1801 - 20 - 52 Operations of Trigonometrical Survey by Lambton 1800 to 1818.jpg
From: https://commons.wikimedia.org/wiki/File:1801_-_20_-_52_Operations_of_Trigo... Uploaded by Shyamal. Last modified 7 months ago. 6 control points. Links: ![]() ![]() |