Philadelphia, Feb. [blank], 1795 : Sir, Having from early age been concerned in working mines, and smelting and refining ores in Europe, and also several years engaged in the same line in the United States, I wish to become useful in promoting the opening of mines in this country [Elektronische Ressource]
Ort / Verlag
S.l. : Printed by John Snowden and William M'Corkle
Ascribed to the press of John Snowden and William M'Corkle by Evans. - Circular letter advertising a course of lectures on mineralogy; includes a syllabus. - Evans, 28822. - Rink, E. Technical Americana, 3345. - Signed: Benjamin Henfrey. From the Gap-Copper-Mines, Lancaster County