Columbia subject headings:
Pottery industry--Italy--Orvieto--History--Sources.
Pottery industry--Italy--Orvieto--History.
Pottery, Italian--Italy--Orvieto--History--Sources.
Pottery, Italian--Italy--Orvieto--History.
Harvard subject headings:
Potters--Italy--Orvieto--History--Sources.
Pottery--Italy--Orvieto--History--Sources.
Princeton subject headings:
Potters--Italy--Orvieto--History--Sources.
Pottery--Italy--Orvieto--History--Sources.