This is fig.10 (part of fig.10) from Scheidig 1934. This fantastic book is still a source of good things, and modified sketch maps will continue to be published. If one is allowed a little criticism it is that some of the maps are too small- so attempts at enlargement will be made.
Here we are to the west of High Asia but the classic deterministic model of loess deposit formation works well. Particle origins in the high mountains, substantial rivers for material transportation etc. The cities of Samarkand and Tashkent are emphasized on the sketch map- this is a classic loess region; many loess investigators were based in Tashkent in Soviet times and there is continuing academic interest in the region.
Most of the literature is in Russian; there is a fairly recent review:
Smalley, I.J., Mavlyanova, N.G., Rahkmatullaev, Kh.L., Shermatov, M.Sh., Machalett, B., O'Hara-Dhand, K., Jefferson, I.F. 2006.. The formation of loess deposits in the Tashkent region and parts of Central Asia; and problems with irrigation, hydrocollapse and soil erosion. Quaternary International 152/153, 59-69.
[this paper should be accessible via the University of Birmingham website].
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