Columbia subject headings:
Genetics--Congresses.
Genetics--History--Congresses.
Mendel, Gregor, 1822-1884.
Harvard subject headings:
Genetics--History--Congresses.
Mendel, Gregor, 1822-1884.
Princeton subject headings:
Genetics--History--Congresses.
Mendel, Gregor, 1822-1884.