Columbia subject headings:
Harvard subject headings:
Aragon (Spain)--History.
Artisans--Spain--Aragon--History.
Industries--Spain--Aragon--History.
Sociedad Económica Aragonesa de Amigos del País--History.
Princeton subject headings:
Aragon (Spain)--History--Sancho Ramírez, 1063-1094.
Artisans--Spain--Aragon--History.
Sociedad Económica Aragonesa de Amigos del País--History.