Columbia subject headings:
Architecture, Roman--Congresses.
Building materials--Economic aspects--Rome--Congresses.
Public architecture--Economic aspects--Rome--Congresses.
Public buildings--Economic aspects--Rome--Congresses.
Harvard subject headings:
Architecture, Roman--Congresses.
Building materials--Economic aspects--Rome--Congresses.
Public architecture--Economic aspects--Rome--Congresses.
Public buildings--Economic aspects--Rome--Congresses.
Princeton subject headings:
Architecture, Roman--Congresses.
Building materials--Economic aspects--Rome--Congresses.
Public architecture--Economic aspects--Rome--Congresses.
Public buildings--Economic aspects--Rome--Congresses.