Browsing by Author "Ashley, G. H."
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Item Contributions to economic geology 1916(Washington: Government Printing Office, 1917) White, David; Ashley, G. H.; Campbell, M. R.Item Contributions to economic geology 1918(Washington: Government Printing Office, 1919) White David; Ashley, G. H.; Campbell, M. R.Item Contributions to economic geology 1919(Washington: Government Printing Office, 1920) White, David; Ashley, G. H.