Columbia subject headings:
Harvard subject headings:
Archaeology--Italy--Marche--Guidebooks.
Archaeology--Italy--Umbria--Guidebooks.
Italy--Antiquities--Guidebooks.
Marche (Italy)--Antiquities--Guidebooks.
Umbria (Italy)--Antiquities--Guidebooks.
Princeton subject headings:
Guidebooks.
Italy--Antiquities--Guidebooks.
Marche (Italy)--Antiquities--Guidebooks.
Umbria (Italy)--Antiquities--Guidebooks.