Columbia subject headings:
Briefs, Papal.
Catholic Church. Pope. Registra Vaticana.
Martin IV, Pope, approximately 1210-1285--Correspondence.
Papacy--History--To 1309--Sources.
Harvard subject headings:
Archivio vaticano. Manuscript. Reg. Vat. 42.
Briefs, Papal.
Church history--13th century--Sources.
Martin IV, Pope, approximately 1210-1285--Correspondence.
Papacy--History--To 1309--Sources.
Princeton subject headings: