Columbia subject headings:
Brazil--Commerce--History.
Portugal--Commercial policy--History.
Slave trade--Angola--History.
Slave trade--Brazil--History.
Slave trade--Portugal--History.
Slave traders--Angola--History.
Harvard subject headings:
Brazil--Commerce--History.
Portugal--Commercial policy--History.
Slave trade--Angola--History.
Slave trade--Brazil--History.
Slave trade--Portugal--History.
Slave traders--Angola--History.
Princeton subject headings:
Brazil--Commerce--History.
Portugal--Commercial policy--History.
Slave trade--Angola--History.
Slave trade--Brazil--History.
Slave trade--Portugal--History.
Slave traders--Angola--History.