The British negociator, or, Foreign exchanges made perfectly easy : containing tables for all the various courses of exchange ... tables and rules for exchanges ... arbitrations of exchanges ... the weights and measures of foreign nations : to which is annexed, several mercantile tables ... and an essay on the nature and business of exchanging in general, is prefixed by way of introduction / - Slack, Thomas, (Printed for G. Robinson and T. Slack,, 1784)