Columbia subject headings:
Harvard subject headings:
Intellectual cooperation--History--20th century--Congresses.
Learned institutions and societies--Europe--History--20th century--Congresses.
Reconstruction (1914-1939)--Congresses.
Science--Europe--History--20th century--Congresses.
Princeton subject headings:
Intellectual cooperation--History--20th century.
Learned institutions and societies--Europe--History--20th century.
Reconstruction (1914-1939)
Science--Europe--History--20th century.