Browsing by Author "Campbell, M. R."
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Item Contributions to economic geology 1915(Washington: Government Printing Office, 1916) Campbell, M. R.; White, DavidItem 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 1920(Washington: Government Printing Office, 1921) White, David; Campbell, M. R.Item Contributions to economic geology 1921(Washington: Government Printing Office, 1922) White, David; Campbell, M. R.