Columbia subject headings:
Authors, German--20th century--Correspondence.
Frommel, Wolfgang, 1902-1986--Correspondence.
Harvard subject headings:
Authors, German--20th century--Correspondence
Buri, Friedrich W., 1919-1999,--Correspondence
Buri, Friedrich W., 1919-1999--Correspondence.
Frommel, Wolfgang, 1902-1986--Correspondence.
Princeton subject headings:
Authors, German--20th century--Correspondence.
Buri, Friedrich W., 1919-1999--Correspondence.
Frommel, Wolfgang, 1902---Correspondence.