Columbia subject headings:
Slave traders--Spain--Barcelona--History.
Slavery--Spain--Barcelona--History.
Slaves--Spain--Barcelona--History.
Harvard subject headings:
Slave trade--Spain--Barcelona--History.
Slave traders--Spain--Barcelona--History.
Slavery--Spain--Barcelona--History.
Slaves--Spain--Barcelona--History.
Princeton subject headings:
Slave trade--Spain--Barcelona--History.
Slave traders--Spain--Barcelona--History.
Slavery--Spain--Barcelona--History.
Slaves--Spain--Barcelona--History.