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Contributions to economic geology (short papers and preliminary reports), 1926. Part I. -- Metals and nonmetals except fuels. G.F. Loughlin and G.R. Mansfield, geologists in charge.
Espandi opera
...
Contributions to economic geology. (Short papers and preliminary reports). 1927. Part I -- Metals and nonmetals except fuels. G.F. Loughlin and G.R. Mansfield, geologists in charge.
Espandi opera
...