Columbia subject headings:
Harvard subject headings:
Hegner family.
Hegner, Ignacy, -1924--Correspondence.
Poland--Description and travel
Polish people--Correspondence.
Warsaw (Poland)--Description and travel.
Princeton subject headings:
Hegner family.
Hegner, Ignacy, -1924--Correspondence.
Poland--Description and travel.
Polish people--Correspondence.
Warsaw (Poland)--Description.