Columbia subject headings:
Harvard subject headings:
Authors, Norwegian--20th century--Correspondence.
Undset, Sigrid, 1882-1949--Correspondence.
Wiberg, Ragnhild Undset.
Princeton subject headings:
Authors, Norwegian--20th century--Correspondence.
Undset, Sigrid, 1882-1949--Correspondence.
Wiberg, Ragnhild Undset.