Columbia subject headings:
Harvard subject headings:
Federico, da Montefeltro, Duke of Urbino, 1422-1482.
Fossombrone (Italy)--Buildings, structures, etc.
Fossombrone (Italy)--History.
Historic buildings--Italy--Fossombrone.
Princeton subject headings:
Federico, da Montefeltro, Duke of Urbino, 1422-1482.
Fossombrone (Italy)--Buildings, structures, etc..
Fossombrone (Italy)--History.
Historic buildings--Italy--Fossombrone.