Columbia subject headings:
Dan, F. (Fedor), 1871-1947.
Harvard subject headings:
Dan, F. (Fedor), 1871-1947--Correspondence.
Rossiĭskai︠a︡ sot︠s︡ial-demokraticheskai︠a︡ rabochai︠a︡ partii︠a︡.
Socialists--Soviet Union--Correspondence.
Princeton subject headings:
Dan, F. (Fedor), 1871-1947--Correspondence.
Rossiĭskai︠a︡ sot︠s︡ial-demokraticheskai︠a︡ rabochai︠a︡ partii︠a︡.
Socialists--Soviet Union--Correspondence.