The merchants map of commerce : wherein the universal manner and matter relating to trade and merchandize are fully treated of, the standard and current coins of most princes and republicks observ'd, the real and imaginary coins of accounts and exchanges express'd ; the natural products and artificial commodities and manufactures for transportation declar'd ; the weights and measures of all eminent cities and towns of traffick in the universe, collected one into another; and all re-traffick in the universe, collected one into another; and all reduc'd to the meridian of commerce practis'd in the famous city of London / by Lewis Roberts ..