Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Brief account of equipment and operations of Porter Bros Corp at lower end of Last Chance Gulch, about 1 mi north of city of Helena, Mont; operating cost over 4 1/2 yr is $0.0491 per cu yd on gravel averaging 42 ft deep.
Brief account of equipment and operations of Porter Bros Corp at lower end of Last Chance Gulch, about 1 mi north of city of Helena, Mont; operating cost over 4 1/2 yr is $0.0491 per cu yd on gravel averaging 42 ft deep.
Running 6-cu ft dredge at Helena, Montana
Eng Min J
Mann, D.M. (Autor:in)
1940
Aufsatz (Zeitschrift)
Englisch
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