Biller, D. (1994). Informal gold mining and mercury pollution in Brazil. The World Bank, Policy Research Dept., Public Economic Division.
Lua i Stíl Chicago (17ú heag.)Biller, Dan. Informal Gold Mining and Mercury Pollution in Brazil. Washington, D.C: The World Bank, Policy Research Dept., Public Economic Division, 1994.
Lua MLA (9ú heag.)Biller, Dan. Informal Gold Mining and Mercury Pollution in Brazil. The World Bank, Policy Research Dept., Public Economic Division, 1994.
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