Columbia subject headings:
Basilica di San Pietro in Vaticano--Congresses.
Christian art and symbolism--Vatican City--Congresses.
Church architecture--Vatican City--History--Congresses.
Vatican City--Buildings, structures, etc.--Congresses.
Harvard subject headings:
Basilica di San Pietro in Vaticano--Congresses.
Basilica di San Pietro in Vaticano--History.
Christian art and symbolism--Vatican City--Congresses.
Church architecture--Vatican City--Congresses.
Church decoration and ornament--Vatican City.
Vatican City--Buildings, structures, etc.
Vatican City--Buildings, structures, etc.--Congresses.
Princeton subject headings:
Basilica di San Pietro in Vaticano--Congresses.
Christian art and symbolism--Vatican City--Congresses.
Church architecture--Vatican City--History--Congresses.
Vatican City--Buildings, structures, etc.--Congresses.