Columbia subject headings:
Argenta (Italy)
Art--Italy--Argenta.
Art--Italy--Comacchio.
Art--Italy--Po River Valley.
Comacchio (Italy)
Po River Valley (Italy)
Harvard subject headings:
Argenta (Italy)--Description and travel.
Art--Italy--Argenta.
Art--Italy--Comacchio.
Art--Po river and valley.
Comacchio (Italy)--Description and travel.
Po River and Valley--Description and travel.
Princeton subject headings:
Argenta (Italy)--Description and travel.
Art--Italy--Argenta.
Art--Italy--Comacchio.
Art--Po river and valley.
Comacchio (Italy)--Description and travel.
Po River and Valley--Description and travel.