Progress Evaluation Meeting in the Matter of Pollution of the Interstate Waters of the Potomac River and Its Tributaries--(Washington Metropolitan Area)--District of Columbia-Maryland-Virginia (1969 : Washington, D.C)
Conference in the Matter of Pollution of the Interstate Waters of the Lower Savannah River and Its Estuaries, Tributaries, and Connecting Waters--Georgia--South Carolina (2nd session : 1969 : Savannah)
Conference in the Matter of Pollution of the Interstate Waters of the Grand Calumet River, Little Calumet River, Calumet River, Wolf Lake, Lake Michigan and Their Tributaries in the States of Indiana and Illinois (2nd : 1969 : Chicago, Ill.)
Conference in the Matter of Pollution of the Interstate Waters of the Hudson River and its Tributaries--New York and New Jersey (2nd : 1967 : New York)