Columbia subject headings:
Plant geneticists--Soviet Union--Correspondence.
Vavilov, N. I. (Nikolaĭ Ivanovich), 1887-1943--Correspondence.
Harvard subject headings:
Plant geneticists--Soviet Union--Correspondence.
Vavilov, N. I. (Nikolaĭ Ivanovich), 1887-1943--Correspondence.
Princeton subject headings:
Vavilov, N. I. (Nikolaĭ Ivanovich), 1887-1943--Correspondence.