Columbia subject headings:
Frank, S. L. (Semen Li︠u︡dvigovich), 1877-1950--Bibliography.
Philosophy--Bibliography.
Harvard subject headings:
Frank, S. L. (Semen Li︠u︡dvigovich), 1877-1950--Bibliography.
Philosophy--Bibliography
Princeton subject headings:
Frank, S. L. (Semen Li︠u︡dvigovich), 1877-1950--Bibliography.