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Subject
- Great Trigonometrical Survey of India1
- Himalaya Mountains—Discovery and exploration—Maps1
- Himalaya Mountains—Maps[remove]1
- India, Northeastern—Maps[remove]1
- Lop Nur (China)—Maps[remove]1
- Qinghai Sheng (China)—Maps1
- Sichuan Sheng (China)—Maps1
- Surveying1
- Tibet Autonomous Region (China)—Maps1
- Tibet—Discovery and exploration—Maps1
- Triangulation1