Columbia subject headings:
Artisans--Spain--History.
Boards of trade--Spain--History.
Guilds--Spain--History.
Merchants--Spain--History.
Spain--Commerce--History.
Harvard subject headings:
Artisans--Spain--History.
Boards of trade--Spain--History.
Guilds--Spain--History.
Merchants--Spain--History.
Spain--Commerce--History.
Princeton subject headings:
Businessmen--Spain--History.
Middle class--Spain--History.
Spain--Commerce--History.