Columbia subject headings:
Russian language--1300-1700--History--Sources.
Russian language--To 1300--History--Sources.
Harvard subject headings:
Russian language--Historiography.
Russian language--History--Sources.
Russian language--Lexicology, Historical.
Princeton subject headings:
Russian language--1300-1700.
Russian language--To 1300.
Russian literature--To 1700--Criticism, Textual.