The British mercantile academy, or, The accomplished merchant [microform] : shewing the necessity of young merchants being bred to trade with greater advantages than they usually are : with a practicable plan to be carried into execution for that purpose : also some considerations on the usefulness of this institution to the young nobility and gentry, and such who are intended for the study of the law / by Malachy Postlethwayt, and James Royston.