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Ventilation problems at the united verde mine
With continued vertical depth system formerly used proved inadequate, and company has since 1924 expended $150,000 improving old and establishing new airways.
Ventilation problems at the united verde mine
With continued vertical depth system formerly used proved inadequate, and company has since 1924 expended $150,000 improving old and establishing new airways.
Ventilation problems at the united verde mine
Min. Congress Jl
Mills, C.E. (author)
1927
7 pages
6 Figs.
Article (Journal)
English
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