Columbia subject headings:
Bahr-Mildenburg, Anna, 1872-1947--Correspondence.
Composers--Austria--Correspondence.
Mahler, Alma, 1879-1964--Correspondence.
Mahler, Gustav, 1860-1911--Correspondence.
Singers--Austria--Correspondence.
Harvard subject headings:
Bahr-Mildenburg, Anna, 1872-1947--Correspondence.
Composers--Austria--Correspondence
Mahler, Alma, 1879-1964--Correspondence.
Mahler, Gustav, 1860-1911--Correspondence.
Singers--Austria--Correspondence.
Princeton subject headings:
Bahr-Mildenburg, Anna, 1872-1947--Correspondence.
Bahr-Mildenburg, Anna, 1872-1947.
Mahler, Gustav, 1860-1911--Correspondence.