Columbia subject headings:
Einstein, Albert, 1879-1955.
General relativity (Physics)--Congresses.
Gravitation--Congresses.
Harvard subject headings:
Einstein, Albert, 1879-1955
General relativity (Physics)--Congresses.
Gravitation--Congresses
Princeton subject headings:
Einstein, Albert, 1879-1955.
General relativity (Physics)--Congresses.
Gravitation--Congresses.