The art of manufacturing saltpetre : By cheap, easy, and expeditious methods. Compiled from different authors--reduced to practice, &c. By Israel Aber, Junior, citizen of Morris County, New-Jersey. This art, if propagated and practised, as it might be, in North America, i sufficient to produce a source of wealth, equal to the mines of Peru, in South America. - Aber, Israel. (J. Woods, printer, Newark, New-Jersey,, 1796)