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U.S. Geological Survey
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U.S. Geological Survey
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https://hdl.handle.net/2346/61588
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Browsing U.S. Geological Survey by Author "Ashley, G. H."
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Contributions to economic geology 1916
(
Washington: Government Printing Office
,
1917
)
White, David
;
Ashley, G. H.
;
Campbell, M. R.
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Item
Contributions to economic geology 1918
(
Washington: Government Printing Office
,
1919
)
White David
;
Ashley, G. H.
;
Campbell, M. R.
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Item
Contributions to economic geology 1919
(
Washington: Government Printing Office
,
1920
)
White, David
;
Ashley, G. H.
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