Columbia subject headings:
Authors, American--20th century--Directories.
Novelists, American--20th century--Directories.
Poets, American--20th century--Directories.
Harvard subject headings:
Authors, American--20th century--Directories.
Novelists, American--20th century--Directories.
Poets, American--20th century--Directories.
Princeton subject headings:
Authors, American--20th century--Directories.