Sage, Balthazar Georges, 1740-1824.
Acc. Arte de ensayer el oro y la plata.
82- Madrid : Por D.J. Ibarra, 1785.
ao BPL's copy imperfect: t.p. and p. 97-8 lacking.
Jenkins Palau 284765.
750 This copy bound with a manuscript on metals
Josiah (leaves 1 & 2 wanting). A tomo 2 is bound Whitney separately and has title "Arte del beneficio
de metals."