Columbia subject headings:
Harvard subject headings:
Associazione cooperativa muratori e affini di Ravenna.
Bricklayers--Labor unions--Italy--Ravenna (Province)--History.
Labor movement--Italy--Ravenna (Province)--History.
Ravenna (Italy : Province)--Politics and government.
Princeton subject headings:
ACMAR (Organization)
Bricklayers--Labor unions--Italy--Ravenna (Province)--History.
Labor movement--Italy--Ravenna (Province)--History.
Ravenna (Italy : Province)--Politics and government.