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Concrete roof supports
A successful application of concrete to replace timber roof supports in the Shamokin, Pa., region, is illustrated and described. (1500 w.) (No. 85421 C)
Concrete roof supports
A successful application of concrete to replace timber roof supports in the Shamokin, Pa., region, is illustrated and described. (1500 w.) (No. 85421 C)
Concrete roof supports
Mines Min
1907
Article (Journal)
English
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