Sketch map of part of Tibet showing the explorations and journeys of <a href="https://en.wikipedia.org/wiki/Sven_Hedin" class="extiw" title="wikipedia:Sven Hedin">Dr. Sven Hedin</a>, 1906-1908. Published by the Royal Geographical Society.
Scale 1:3,800,000.
Royal Geographical Society
1909
<a rel="nofollow" class="external free" href="https://www.loc.gov/resource/g7823t.ct000019/">https://www.loc.gov/resource/g7823t.ct000019/</a>