I haven't used this series in a long time so the name escapes me, but I'm sure someone on this list knows the title. This looks like the type of map that might appear in the land boundary version of Limits in the Seas (U.S. State Department). We don't have a set of that here to confirm with a physical copy though.

Craig

Craig Haggit
Senior Special Collections Librarian, Western History and Genealogy Dept.
Denver Public Library
10 West 14th Ave. Parkway
Denver, CO  80204
720-865-1813

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On Tue, May 17, 2022 at 10:56 AM Tsering W. Shawa <[log in to unmask]> wrote:
I have recently purchased a copy of map (Sheet II) used for defining the northeastern boundary of British India and Tibet on March 24, 1914, on eBay. This boundary is commonly known as the McMahon line. I found a low-resolution copy of both maps on Wikimedia  (https://upload.wikimedia.org/wikipedia/commons/6/62/McMahon_Line_Simla_Accord_Treaty_1914_Map1.jpg
https://upload.wikimedia.org/wikipedia/commons/7/79/McMahon_Line_Simla_Accord_Treaty_1914_Map2.jpg). 
It seems the map I purchased was taken from a book. I contacted the seller for the book name, but he does not remember the name. Has anyone seen these maps in a book?

The maps used for defining the boundary were published by the Survey of India on August 1913 and the scale of the maps is 1 inch to 8 miles, the names of the sheet are: North East Frontier Sheet I and Sheet II. Does anyone have these maps in your collection? If you do, would you mind sharing a digital copy with me?  

Thanks,
-Wangyal

Tsering Wangyal Shawa

GIS and Map Librarian

​Head, Map and Geospatial Information Center

Peter B. Lewis Library

Washington Road & Ivy Lane

Princeton University, Princeton, NJ 08544

Telephone: 609-258-6804

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http://library.princeton.edu/collections/pumagic