Columbia subject headings:
Harvard subject headings:
Civil engineering--History--To 1500--Congresses.
Infrastructure (Economics)--History--To 1500--Congresses.
Public works--History--To 1500--Congresses.
Social change--History--To 1500--Congresses.
Princeton subject headings:
Civil engineering--History--To 1500--Congresses.
Public works--History--To 1500--Congresses.