Não informado. Comparative statistics of lead, copper. Metallurgische Gesellschaft.
Lua i Stíl Chicago (17ú heag.)Não informado. Comparative Statistics of Lead, Copper. Frankfurt, Alemanha: Metallurgische Gesellschaft.
Lua MLA (8ú heag.)Não informado. Comparative Statistics of Lead, Copper. Metallurgische Gesellschaft.
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