Columbia subject headings:
Heine, Thomas Theodor, 1867-1948--Correspondence.
Schoenberner, Franz, 1892-1970.
Harvard subject headings:
Heine, Thomas Theodor, 1867-1948--Correspondence.
Schoenberner, Franz, 1892-
Princeton subject headings:
Heine, Thomas Theodor, 1867-1948--Correspondence.
Schoenberner, Franz, 1892-1970.