Columbia subject headings:
Educators--Ukraine--Biography.
Lʹviv (Ukraine)--History.
Opałek, Mieczysław, 1881-1964.
Harvard subject headings:
Educators--Ukraine--Biography
Lʹviv (Ukraine)--History.
Opałek, Mieczysław, 1881-1964
Princeton subject headings:
Lʹviv (Ukraine)--History.
Opałek, Mieczysław, 1881-1964.