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Keywords from Image Description:
SEWAGE SLUDGE SETTLES ON BOTTOM OF BEAKER. SEWAGE TREATMENT PLANT NARA . Scope and content General notes Local identifier DA Environmental Protection Agency NARAAuthor Gillette Bill Photographer File SEWAGESLUDGESETTLESONBOTTOMOFBEAKER SEWAGETREATMENTPLANTNARA tif tif File SEWAGESLUDGESETTLESONBOTTOMOFBEAKER SEWAGETREATMENTPLANTNARA