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Subject
- Great Trigonometrical Survey of India2
- Himalaya Mountains—Discovery and exploration—Maps2
- Himalaya Mountains—Maps[remove]2
- India, Northeastern—Maps[remove]2
- Tibet Autonomous Region (China)—Maps2
- Tibet—Discovery and exploration—Maps2
- Lop Nur (China)—Maps1
- Physical geography—Himalaya Mountains—Maps1
- Qinghai Sheng (China)—Maps1
- Sichuan Sheng (China)—Maps1
- Surveying1
- Triangulation1