Columbia subject headings:
Architectural terra-cotta--Conservation and restoration--Congresses.
Decoration and ornament, Architectural--Conservation and restoration--Congresses.
Tiles--Conservation and restoration--Congresses.
Harvard subject headings:
Architectural terra-cotta--Congresses.
Architectural terra-cotta--Conservation and restoration--Congresses,
Decoration and ornament, Architectural--Congresses.
Decoration and ornament, Architectural--Conservation and restoration--Congresses.
Princeton subject headings:
Architectural terra-cotta--Congresses.
Architectural terra-cotta--Conservation and restoration--Congresses,.
Decoration and ornament, Architectural--Congresses.
Decoration and ornament, Architectural--Conservation and restoration--Congresses.