The trader's pocket companion : containing, correct tables, ready calculated, of universal use to merchants, shopkeepers, mechanicks, and to all other persons in any kind of business, ... By John Hewitt. - Hewitt, John (printed for C. Hitch and L. Hawes, G. Keith, J. Rivington, R. Baldwin, S. Crowder and Co. B. Law and Co. C. and R. Ware, J. Fox, T. Hope, and E. Withers,, 1760)