Columbia subject headings:
Vernadskiĭ, V. I. (Vladimir Ivanovich), 1863-1945--Correspondence.
Vinogradov, A. P. (Aleksandr Pavlovich), 1895-1975--Correspondence.
Harvard subject headings:
Vernadskiĭ, V. I. (Vladimir Ivanovich), 1863-1945--Correspondence.
Vinogradov, A. P. (Aleksandr Pavlovich), 1895-1975--Correspondence.
Princeton subject headings:
Geologists--Soviet Union--Correspondence.
Vernadskiĭ, V. I. (Vladimir Ivanovich), 1863-1945.
Vinogradov, A. P. (Aleksandr Pavlovich), 1895-1975--Correspondence.