There are numerous historical maps that show Tibet independent of China. What many people don't know is that China made claims that Bhutan and Nepal were also part of China as well, but due to the presence of the British in the Indian Sub-Continent, the Chinese could never enforce their claims
Maps 9-13 I have provided links for are from the website of the Hong Kong University - Science and Technology Library
http://library.ust.hk/info/exhibit/maps-9706/map-gallery2.html
- 1935 - look at the glass map following link
http://www.marybakereddylibrary.org/exhibits/mapparium
This map is a hollow globe that you can walk through if you are even in Boston
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1898 - http://www.archetypal.com/xanadu/gallery/tibetan_map.html
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1877 - http://tibettruth.files.wordpress.com/2009/03/map_hindoostan01_xl1.jpg
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1888 - http://www.probertencyclopaedia.com/photolib/maps/Map%20of%20Tibet%201888.htm
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1906 - http://www.probertencyclopaedia.com/photolib/maps/Map%20of%20Tibet%201906.htm
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1932 - http://www.probertencyclopaedia.com/photolib/maps/Map%20of%20Tibet%201932.htm
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Evolutionary maps of Chinese Empire
http://www.zum.de/whkmla/histatlas/china/haxchina.html -
A 1892 map of China that show both Tibet and Mongolia as part of China. Why are the Chinese making not making claims on Mongolia?
http://www.lib.utexas.edu/maps/historical/asia_1892_amer_ency_brit.jpg
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1625 map of China with Sichuan and West not part of China
http://library.ust.hk/res/lib-db/MAPS/disk1/PDF/IMG0046.pdf -
1650 - http://library.ust.hk/res/lib-db/MAPS/disk1/PDF/IMG0047.pdf
Map of Asia, with Tibetan regions part of India and Tartaria -
Map of Inda, with Tibetan regions apparently in Inida
http://library.ust.hk/res/lib-db/MAPS/disk1/PDF/IMG0024.pdf
12 http://library.ust.hk/res/lib-db/MAPS/disk2/PDF/IMG0040.pdf
