Title |
Exploration for porphyry metal deposits based on rutile distribution-- a test in Sumatera : a new exploration tool for porphyry deposits in the tropics / by Eric R. Force, Sukirno Djaswadi, and Theo van Leeuwen. Titanium mineral resources of the United States-- definitions and documentation / by Eric R. Force and Langtry G. Lynd. |
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