English and Welsh mines and minerals discovered : in some proposals to the honourable House of Commons ; for employing the poor, to gain the hidden treasures of this kingdom, (which are here proved to be above 30 different species of metals and minerals,) so as to encrease the royal revenue a million a year, the wealth of the nation many millions; and give opportunity to establish as strong forces at land without charge as the nation may require; strengthen the fleet, and occasionally suppress vice : some remarks for importing a certain number of Irish lean cattel and corn; and taking off some grievous oppressions, by a court of conscience and this mineral manufacture /