Authority of Secretary. The Secretary shall conduct in the Service, and encourage, cooperate with, and render as- sistance to other appropriate public authorities, scientific institutions, and scientists in the con- duct of, and promote the coordination of, re- search, investigations, experiments, demonstra- tions, and studies relating to the causes, diag- nosis, treatment, control, and prevention of physical and mental diseases and impairments of man, including water purification, sewage treatment, and pollution of lakes and streams. In carrying out the foregoing the Secretary is authorized to—
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