Columbia subject headings:
Harvard subject headings:
Mitrofanov, Aleksei Khristoforovich, 1879?-1941.
Ruser, Leonid Isaakovich, -1959.
Syromolotov, Fedor Fedorovich, 1887-1949.
Princeton subject headings:
Ural Mountains Region (Russia)--History--Revolution, 1917-1921--Biography.