Columbia subject headings:
Piwitt, Hermann Peter, 1935-
Harvard subject headings:
Authors, German--20th century--Biography
Authors, German--21st century--Biography.
Germany--Intellectual life--20th century.
Piwitt, Hermann Peter, 1935-
Piwitt, Hermann Peter, 1935---Friends and associates.
Princeton subject headings:
Authors, German--20th century--Biography.
Authors, German--21st century--Biography.
Piwitt, Hermann Peter, 1935-