Blake, William, F. R. S. Observations on the principles which regulate the course of exchange; and on the present depreciated state of the currency. By William Blake, Esq. F.R.S. - London : Printed for Edmund Lloyd, 1810. - iv, 132p. Subjects--Topical Terms: Currency question--Great Britain. Subjects--Geographic Terms: Great Britain--History--George III, 1760-1820.