Columbia subject headings:
Kazanskiĭ kraĭ (Russia)--History--Sources--Bibliography.
Harvard subject headings:
Kazanskiĭ kraĭ (R.S.F.S.R.)--History--Sources--Bibliography.
Princeton subject headings:
Kazanskoe khanstvo--History--Sources.
Kazanʹ region (Russia)--History--Sources.