Columbia subject headings:
Castello (Florence, Italy)--History.
Ecology--Italy--Tuscany.
Tuscany (Italy)--Geography.
Tuscany (Italy)--History.
Harvard subject headings:
Castello (Florence, Italy)--History.
Demography--Italy--Florence Region.
Ecology--Italy--Tuscany.
Florence Region (Italy)--Geography.
Florence Region (Italy)--Maps.
Geology--Italy--Florence Region.
Tuscany (Italy)--Geography.
Tuscany (Italy)--History.
Princeton subject headings:
Demography--Italy--Florence Region.
Florence Region (Italy)--Geography.
Florence Region (Italy)--Maps.
Geology--Italy--Florence Region.