@book{ BA42149751,
 author = "McMahon, Gary",
 title = "An environmental study of artisanal, small, and medium mining in Bolivia, Chile, and Peru",
 publisher = "World Bank",
 year = "1999",
 series = "World Bank technical paper",
 number = "no. 429",
 URL = "https://ci.nii.ac.jp/ncid/BA42149751"
}
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