Philadelphia, Feb. [blank], 1795.
Subtitle: 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 ..
Series: Early American imprints -- no. 28822.
Publisher: Printed by John Snowden and William M'Corkle
Published: 1795
Place of publication: [Philadelphia
Language: eng
Format: Microform
Subjects: Lectures and lecturing -- Pennsylvania -- Lancaster County.; Mines and mineral resources -- Pennsylvania -- Lancaster County.
Notes: Circular letter advertising a course of lectures on mineralogy; includes a syllabus.

Signed: Benjamin Henfrey. From the Gap-Copper-Mines, Lancaster County.

Ascribed to the press of John Snowden and William M'Corkle by Evans.

Evans 28822.

Rink, E.  Technical Americana, 3345.

Microfiche. [New York : Readex Microprint, 1985] 11 x 15 cm. (Early American imprints. First series ; no. 28822)