Columbia subject headings:
Harvard subject headings:
Occupations--Spain--Zaragoza--History.
Social classes--Spain--Zaragoza--History.
Social structure--Spain--Zaragoza--History.
Zaragoza (Spain)--Economic conditions.
Zaragoza (Spain)--History.
Zaragoza (Spain)--Social conditions.
Princeton subject headings:
Zaragoza (Spain)--History.