Columbia subject headings:
Hydraulic machinery--France--Normandy--History.
Normandy (France)--Economic conditions.
Steam-engines--France--Normandy--History.
Harvard subject headings:
Hydraulic machinery--France--Normandy--History.
Industries--France--Normandy.
Steam-engines--France--Normandy--History.
Water-power--France--Normandy--History.
Princeton subject headings:
Hydraulic machinery--France--Normandy--History.
Industries--France--Normandy.
Steam-engines--France--Normandy--History.
Water-power--France--Normandy--History.