Colten and Skinner build their study around three key questions. First, what was known before 1970 about the hazards of certain industrial wastes and their potential for causing public health problems? Second, what were the technical capabilities for treating or containing wastes during that time? And third, what factors other than technical knowledge guided the actions of waste managers before the enactment of explicit federal laws? The authors find that significant information about the hazards of industrial wastes existed before 1970. Their explanations of why this knowledge did not prevent the toxic legacy now facing us will be essential reading for environmental historians and lawyers, public health personnel, and concerned citizens.