I’m still collecting material about Otto Torvik and Carl Persson – that were part of the Swdish Mission in East Turkestan in the 1930s.
While I collect more stuff, anyone interested in the Swedish Mission might like to get a look at the Swedish Mission Project on the Internet Archives – which collects all of the films and audio recordings from th eexpedition, plus a link to a nice book on the subject.

An excellent resource.