Columbia subject headings:
Ilʹin, I. A. (Ivan Aleksandrovich), 1883-1954.
Harvard subject headings:
Ilʹin, I. A. (Ivan Aleksandrovich), 1883-1954--Philosophy.
Philosophy and religion.
Princeton subject headings:
Ilʹin, I. A. (Ivan Aleksandrovich), 1883-1954--Philosophy.