Columbia subject headings:
Cosmology--Philosophy.
Ethics.
Philosophy, Russian--19th century.
Rerikh, E. I. (Elena Ivanovna), 1879-1955.
Roerich, Nicholas, 1874-1947.
Theosophy.
Harvard subject headings:
Princeton subject headings:
Cosmology--Philosophy.
Ethics.
Philosophy, Russian--19th century.
Rerikh, E. I. (Elena Ivanovna), 1879-1955.
Roerich, Nicholas, 1874-1947.
Theosophy.