Columbia subject headings:
Harvard subject headings:
Biology--Germany--History--20th century--Congresses.
Germany--History--1933-1945--Congresses.
Medicine--Germany--History--20th century
Medicine--Germany--History--20th century--Congresses.
National socialism and science.
Science--Germany--History--20th century--Congresses.
Technology--Germany--History--20th century
Princeton subject headings:
Medicine--Germany--History--20th century.
National socialism and science.
Technology--Germany--History--20th century.