Columbia subject headings:
Harvard subject headings:
Area specialists--Soviet Union--Biography.
Kler, O. E. (Onisim Egorovich), 1845-1920.
Kler, Onisim Egorovich, 1845-1920.
Ural Mountains Region (Russia)--Study and teaching--Soviet Union.
Ural Mountains Region (Russia)--Study and teaching.
Princeton subject headings:
Area specialists--Russia--Biography.
Area specialists--Soviet Union--Biography.
Kler, Onisim Egorovich, 1845-1920.
Ural Mountains Region (Russia)--Study and teaching.