Columbia subject headings:
Science news--Germany--History--19th century--Congresses.
Science news--History--19th century--Congresses.
Science--Social aspects--Germany--History--19th century--Congresses.
Science--Social aspects--History--19th century--Congresses.
Harvard subject headings:
Communication in science--History--19th century--Congresses.
Learning and scholarship--History--19th century--Congresses.
Science news--Germany--History--19th century--Congresses.
Science news--History--19th century--Congresses.
Science--History--19th century--Congresses.
Science--Social aspects--Germany--History--19th century--Congresses.
Science--Social aspects--History--19th century--Congresses.
Princeton subject headings: