Columbia subject headings:
Harvard subject headings:
Herzen, A. (Alexandre), 1839-1906.
Ogarev, N. P. (Nikolaĭ Platonovich), 1813-1877.
Revolutionaries--Soviet Union--Correspondence
Princeton subject headings:
Herzen, A. (Alexandre), 1839-1906.
Ogarev, N. P. (Nikolaĭ Platonovich), 1813-1877.
Revolutionaries--Russia--Correspondence.