Carnegie Library of Pittsburgh - Pittsburgh Iron & Steel Heritage

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Steel, Structural., Mine timbering.
The timbering of mines, particularly with steel
United States Steel and Carnegie Pension Fund -- Periodicals., United States Steel Corporation -- Pensions -- Periodicals., Pension trusts -- United States -- Periodicals., Iron and steel workers -- Pensions -- United States -- Periodicals.
5 volumes 78 x 48 cm.