'An Act to amend an Act of last session of Parliament, for carrying into execution a convention made between His Majesty and the King of Portugal, for the preventing the traffic in slaves'
British Parliamentary bills relating to the abolition of the slave trade: George III, Chapter 17, 'An Act to amend an Act of last session of Parliament, for carrying into execution a convention made between His Majesty and the King of Portugal, for the preventing the traffic in slaves', dated 31 March 1819.