"Calumet-conglomerate."
Subtitle: An exploration and discovery
By: made by Edwin J. Hulbert, 1854 to 1864.
Publisher: Ontonagon-miner press
Published: 1893
Place of publication: [Ontonagon, Mich.]
Language: eng
Number of pages: 148
Subjects: Calumet and Hecla Mining Company.
Notes: Caption title: History of the discovery of the Calumet and Hecla mining co.'s copper-bearing-conglomerate.
A series of letters originally published in the Ontonagon-miner, Michigan, in the year 1893.