Longitudinal sections of Allouez conglomerate and Keweenaw mine

Míreanna comhchosúla

• Longitudinal section of forest Lode, evergreen mine
  de réir: Estados Unidos Geological Survey
  Foilsithe / Cruthaithe: ([19--])
• Sections showing development along fissures from Ahmeek mine to Pennsylvania mine, Keweenaw counyy, Mich.
  de réir: Estados Unidos Geological Survey
  Foilsithe / Cruthaithe: ([19--])
• Plans of Calumet and Hecla conglomerate mine
  de réir: Estados Unidos Geological Survey
  Foilsithe / Cruthaithe: ([19--])
• Manitou-Frontenac, Keweenaw, and North Cliff geologic sections
  de réir: Estados Unidos Geological Survey
  Foilsithe / Cruthaithe: ([19--])
• Longitudinal sections of Ashbed Lode
  de réir: Estados Unidos Geological Survey
  Foilsithe / Cruthaithe: ([19--])