Columbia subject headings:
Authors, American--19th century--Correspondence.
Authors, American--20th century--Correspondence.
Steffens, Lincoln, 1866-1936.
Harvard subject headings:
Authors, American--19th century--Correspondence
Authors, American--20th century--Correspondence
Steffens, Lincoln, 1866-1936.
Princeton subject headings:
Authors, American--19th century--Correspondence.
Authors, American--20th century--Correspondence.
Steffens, Lincoln, 1866-1936.