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SIOUX FALLS, S.D. (AP) — Federal authorities say two children taken by their non-custodial mother in Wisconsin are thought to be in the Black Hills area.U.S. marshals say the mother and children could be camping in a remote area and extreme weather conditions could be difficult to deal with.Officials say Cathy Brown took the children — 9-year-old Dalton Brown and 11-year-old Averie Brown — from Antigo, Wisconsin last month.