Columbia subject headings:
Ferrara (Italy)--Buildings, structures, etc.
Hydraulic engineering--Italy--Ferrara.
Water and architecture--Italy--Ferrara.
Harvard subject headings:
Ferrara (Italy)--Buildings, structures, etc.
Hydraulic engineering--Italy--Ferrara.
Water and architecture--Italy--Ferrara.
Princeton subject headings:
Ferrara (Italy)--Buildings, structures, etc.
Hydraulic engineering--Italy--Ferrara.
Surveying--Italy--Ferrara.
Water and architecture--Italy--Ferrara.