U.S. Geological Survey Plasenzuela Project - More than broken jars and roof tiles, the

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only in this directory Mining Acid Mine Drainage (4) Mountaintop Removal (1) Organizations (10) Products and Services (5)	U.S. Geological Survey Plasenzuela Project - More than broken jars and roof tiles, the Background and preliminary findings of a United States - Spain study of the environmental impact of the Roman mineral industry at Plasenzuela, Extremadura, Spain ...