#502 Potomac Waters: Protection, Conservation, Use? , 07/01/1956.

Col. Ray Adams, District Engineer of the Washington District for the past three years Hon. John R. Fletcher, Circuit Court Judge of the State of Maryland, Member of the interstate Commission on the Potomao River Basin Mr. Ellis Tisdale, Director, Interstate Commission on Potomao River Basin, formerly with the Public Health Service water Pollution Abatement Mr. Mark D. Hollis, Asst. Surgeon General, Chief Engineer of U.S. Public Health Service. Supervisor of National Program for the protection of water resources