General & OtherSinking methods and costs for a small vertical shaft with steel supports : Keystone mine, Crested Butte, ColoradoR. L Bolmer![Sinking methods and costs for a small vertical shaft with steel supports : Keystone mine, Crested Butte, Colorado]()
Sinking methods and costs for a small vertical shaft with steel supports : Keystone mine, Crested Butte, Colorado
R. L Bolmer
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“Sinking methods and costs for a small vertical shaft with steel supports : Keystone mine, Crested Butte, Colorado” by R. L Bolmer: a public-domain book in…
Catalogue details
- Author
- R. L Bolmer
- Category
- General & Other
- Language
- English
- Source
- HathiTrust