Columbia subject headings:
Lʹviv (Ukraine)--History--Chronology.
Poland--History--1918-1945.
Harvard subject headings:
Lʹviv (Ukraine)--History--Chronology.
Poland--History--1918-1945--Chronology.
Princeton subject headings:
Lʹviv (Ukraine)--History--Chronology.
Poland--History--1918-1945--Chronology.