The Challenge of Central Asia. A Brief Survey of Tibet and its Borderlands, Mongolia, North-West Kansu, Chinese Turkistan, and Russian Central Asia. By Mildred Cable, F. Houghton, R. Kilgour, A. McLeish, R. W. Sturt, and Olive Wyon (London/New York: World Dominion Press, 1929)
- Digitized: Internet Archive (digitizing sponsor and book contributor: Internet Archive; microfilm from University of Chicago)
- No copy listed in Wiener China-Bibliographie