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ANEROBIC DIGESTER. RAW SEWAGE SLUDGE MIXED WITH BACTERIA IS HEATED AND BROKEN DOWN INTO NONTOXIC COMPOST... NARA .tif Scope and content General notes Local identifier DA Environmental Protection Agency NARAAuthor Gillette Bill Photographer File ANEROBICDIGESTER RAWSEWAGESLUDGE MIXEDWITHBACTERIA ISHEATEDANDBROKENDOWNINTOANONTOXICCOMPOST