Columbia subject headings:
Petrucci, Andreoccio, approximately 1400-1449.
Siena (Italy)--Civilization.
Siena (Italy)--History--Sources.
Harvard subject headings:
Petrucci, Andreoccio, approximately 1400-1449.
Siena (Italy)--Civilization.
Siena (Italy)--History--Sources.
Princeton subject headings:
Petrucci, Andreoccio, approximately 1400-1449--Correspondence.
Siena (Italy)--Civilization--Sources.
Siena (Italy)--History--Sources.
Siena (Italy)--Politics and government--Sources.