Which ethnographer was shot during the repression? Evidence of the nomadic life of Kazakhs

Researcher, who was watching a caravan wandering along the river, cannot be found in any of his expeditionary photographs, and only his shadow can be seen in some pictures. The scholar was too keen on collecting information about nomadic paths, winter huts and summer camps, nomadic cattle-breeding and farming enterprises, their occupations.  He was planning to include this and other photographs into his «Programme for the Study of the Life of Kazakhs», which could become a great help for young local historians. Where are his photographs stored? Why was he shot? You will learn more about everything in this release of Flashback.