Columbia subject headings:
Fichte, Hubert--Correspondence.
Mau, Leonore--Correspondence.
Harvard subject headings:
Artists--Germany--Correspondence.
Authors, German--20th century--Correspondence
Fichte, Hubert--Correspondence.
Mau, Leonore--Correspondence.
Princeton subject headings:
Fichte, Hubert--Correspondence.
Mau, Leonore--Correspondence.
Personal correspondence.