Columbia subject headings:
Catholic Church--Russia--History--19th century.
Catholic converts--Russia.
Catholics--Russia.
Gagarin, J. (Jean), 1814-1882--Correspondence.
Gagarin, J. (Jean), 1814-1882--Family.
Gagarin, J. (Jean), 1814-1882--Religion.
Jesuits--France--Correspondence.
Jesuits--Russia--History--19th century.
Harvard subject headings:
Catholic Church
Catholic Church--Russia--History--19th century.
Catholic converts--Russia.
Catholics--Russia.
Gagarin, J. (Jean), 1814-1882--Correspondence.
Gagarin, J. (Jean), 1814-1882.
Jesuits
Jesuits--Russia--History--19th century.
Princeton subject headings: