Columbia subject headings:
Duerr, Hans Peter--Correspondence.
Ethnologists--Germany--Correspondence.
Feyerabend, Paul, 1924-1994--Correspondence.
Philosophers--Austria--Correspondence.
Harvard subject headings:
Duerr, Hans Peter--Correspondence.
Ethnologists--Germany--Correspondence.
Feyerabend, Paul, 1924-1994--Correspondence.
Philosophers--Austria--Correspondence.
Princeton subject headings:
Duerr, Hans Peter--Correspondence.
Ethnologists--Germany--Correspondence.
Feyerabend, Paul K., 1924---Correspondence.
Philosophers--Austria--Correspondence.