An exposition of the commerce of Spanish America : with some observations upon its importance to the United States, to which are added, a correct analysis of the monies, weights, and measures of Spain, France, and the United States, and of the new weights and measures of England, with tables of their reciprocal reductions, and of the exchange between the United States, England, France, Holland, Hamburg, and between England, Spain, France, and the several states of the Union / by Manuel Torres.