Columbia subject headings:
Nobility--Russia.
Tverskai︠a︡ gubernii︠a︡ (R.S.F.S.R.)--Genealogy.
Harvard subject headings:
Nobility--Russia (Federation)--Tverskai︠a︡ gubernii︠a︡--History--Sources.
Tverskai︠a︡ gubernii︠a︡ (R.S.F.S.R.)--Genealogy.
Princeton subject headings:
Soviet Union--Nobility.
Tverskai︠a︡ gubernii︠a︡ (R.S.F.S.R.)--Genealogy.