Columbia subject headings:
Authors, German--20th century--Correspondence.
Authors, German--20th century--Diaries.
Heiduczek, Werner--Correspondence.
Heiduczek, Werner--Diaries.
Harvard subject headings:
Authors, German--20th century--Correspondence
Authors, German--20th century--Diaries
Heiduczek, Werner--Correspondence.
Heiduczek, Werner--Diaries.
Princeton subject headings:
Authors, German--20th century--Correspondence.
Authors, German--20th century--Diaries.
Diaries.
Heiduczek, Werner--Correspondence.
Heiduczek, Werner--Diaries.