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Slag Appears In Ncrete Aggregate Road Materials As Ballast And

The author feels that further studies would substantiate such a correlation.Ross, c.S., altered paleozoic volcanic materials and their recognition, am.Soc.Pet.Geol., bui.12, pp.143-164, 1928.As altered volcanic materials are being found in the paleozoic, there is an interest in the criteria for their recognition.

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