Columbia subject headings:
Herold, A.-Ferdinand (André-Ferdinand), 1865-1940--Correspondence.
Vallette, Alfred, 1858-1935--Correspondence.
Harvard subject headings:
Herold, A.-Ferdinand (André-Ferdinand), 1865-1940--Correspondence.
Vallette, Alfred, 1858-1935--Correspondence.
Princeton subject headings:
Herold, A.-Ferdinand (André-Ferdinand), 1865-1940--Correspondence.
Vallette, Alfred, 1858-1935--Correspondence.