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7. The purification of sewage by bacterial oxidation: a study of the natural processes of filth removal and of the means by which their efficiency may be artificially intensified : including a description of works for sewage disposal at Willow Grove Park, Philadelphia, Pa

8. Relationship of supersonic wave frequency and cellulicidal action

9. Relationship of supersonic wave frequency and cellulicidal action (Document Number 55388A)

10. Relationship of supersonic wave frequency and cellulicidal action (Document Number 55388B)