Columbia subject headings:
Harvard subject headings:
Literature, Modern--20th century
Literature, Modern--20th century--Bio-bibliography
Poetry, Modern--20th century--Bio-bibliography--Dictionaries--German.
Poets--20th century--Biography--Dictionaries--German.
Princeton subject headings:
Dictionaries.
Poetry, Modern--20th century--Bio-bibliography--Dictionaries--German.
Poets--20th century--Biography--Dictionaries--German.