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| ꯁꯟꯗꯣꯛꯅꯥ ꯇꯥꯛꯄꯥRamsden zenith sector.jpg | Ramsden's zenith sector, used in the Great Trigonometrical Survey |
| ꯆꯩꯆꯠ | |
| ꯍꯧꯔꯛꯐꯛ | Strahan, C. (1903). "The Survey of India". Professional papers of the Corps of Royal Engineers 28: 141-171. |
| ꯄꯨꯊꯣꯛꯂꯤꯕ ꯃꯤ | C. Strahan |
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