Columbia subject headings:
Harvard subject headings:
Adler, Friedrich, 1879-1960.
Austria--Politics and government--1867-1918.
Socialists--Austria--Biography
Princeton subject headings:
Adler, Friedrich, 1879-1960.
Adler, Victor, 1852-1918.
Austria--Politics and government--1867-1918.
Socialism--Austria--History.