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 Navigable Waters of Dade County, Florida, and Tributaries, Embayments and Coastal Waters (3rd : 1971 : Miami, Fla.)
Conference in the Matter of Pollution of Lake Superior and its Tributary Basin in the States of Minnesota, Wisconsin, and Michigan (1970 : Duluth, Minn.)
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)
Progress Evaluation Meeting in the Matter of Pollution of the Interstate and Intrastate Waters of the Upper Mississippi River and Its Tributaries: Minnesota and Wisconsin (1968 : Minneapolis, Minn.)
Conference in the Matter of Progress Meeting of the Conference Concerning Pollution of the Interstate and Intrastate Waters of the Upper Mississippi River and Its Tributaries - Minnesota and Wisconsin (2nd : 1969 : Minneapolis, Minn.)
Conference in the Matter of Pollution of the Navigable Waters of Dade County, Florida, and Tributaries, Embayments and Coastal Waters (1970 : Miami, Fla.)
Conference in the Matter of Pollution of the Navigable Waters of Moriches Bay and the Eastern Section of Great South Bay and Their Tributaries (1966 : Patchogue, N.Y.)
Conference in the Matter of Pollution of the Interstate and Intrastate Waters of the Upper Mississippi River and Its Tributaries--Minnesota and Wisconsin (2nd : 1967 : Minneapolis)
Conference in the Matter of Pollution of the Interstate Waters of the Chattahoochee River and Its Tributaries--Georgia--Alabama (2nd : 1970 : Atlanta, Ga.)
Conference in the Matter of Pollution of the Interstate Waters of the Merrimack and Nashua Rivers and Their Tributaries (Massachusetts--New Hampshire) and of the Intrastate Portions of Those Waters Within the State of Massachusetts (2nd : 1970 : Bedford, N.H.)