Columbia subject headings:
Doyle, Arthur Conan, 1859-1930--Correspondence.
Harvard subject headings:
Authors, English--19th century--Correspondence
Authors, English--20th century--Correspondence
Doyle, Arthur Conan, 1859-1930--Correspondence.
Letters to the editor.
Princeton subject headings:
Doyle, Arthur Conan, 1859-1930. Correspondence.