Columbia subject headings:
Fedorov, Nikolaĭ Fedorovich, 1828-1903.
Harvard subject headings:
Fedorov, Nikolaĭ Fedorovich, 1828-1903--Criticism and interpretation.
Philosophy, Russian--19th century.
Princeton subject headings:
Fedorov, Nikolaĭ Fedorovich, 1828-1903--Criticism and interpretation.