Columbia subject headings:
Harvard subject headings:
Public opinion--Germany--History--Congresses.
Sozialdemokratische Partei Deutschlands--History--Congresses.
United States--Foreign public opinion--History--Congresses.
Princeton subject headings:
Public opinion--Germany--History--Congresses.
Sozialdemokratische Partei Deutschlands--History--Congresses.
United States--Foreign public opinion--History--Congresses.