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Published under the direction of Colonel C. H. D. Ryder, Surveyor General of India,
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Public
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Geology
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1. Assam, Burma & Tibet : Sadiya Frontier Tract, Putao District, tribal area and Szechwan, Yunnan, Dayul, Nuchugiu Provinces.
Survey of India, compiler, cartographer, issuing body. Published under the direction of Colonel C. H. D. Ryder, Surveyor General of India,.