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Geol. Surv. Canada, Ueport of progress, 

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Geol. Surv. Canada, Eeport of progress, 

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Chemical contributious to the geol- 

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Geol. Surv. Canada, Eeport of progress, 

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Geol. Surv. Canada, Eeport of progress, 

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Chemical contributions to the geol- 

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