Columbia subject headings:
Harvard subject headings:
Fersman, A. E. (Aleksandr Evgenʹevich), 1883-1945.
Geologists--Soviet Union--Correspondence.
Vernadskiĭ, V. I. (Vladimir Ivanovich), 1863-1945.
Princeton subject headings:
Fersman, A. E. (Aleksandr Evgenʹevich), 1883-1945.
Geologists--Soviet Union--Correspondence.
Vernadskiĭ, V. I. (Vladimir Ivanovich), 1863-1945.