चित्र:Ramsden zenith sector.jpg
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सारांश
| बिबरणRamsden zenith sector.jpg | Ramsden's zenith sector, used in the Great Trigonometrical Survey |
| तारीख | |
| स्रोत | Strahan, C. (1903). "The Survey of India". Professional papers of the Corps of Royal Engineers 28: 141-171. |
| लेखक | C. Strahan |
लाइसेंसिंग
| Public domainPublic domainfalsefalse |
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1931. |
| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
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