Columbia subject headings:
Armorers--Russia (Federation)--Tula--History--Sources.
Gunsmiths--Russia (Federation)--Tula--History--Sources.
Harvard subject headings:
Armorers--Russia (Federation)--Tula--History--Sources.
Gunsmiths--Russia (Federation)--Tula--History--Sources.
Princeton subject headings:
Gunsmithing--Russia--History.
Tula (Russia)--History.