"... Annual summary ... "; "Ohio River Valley Water Sanitation Commission."; "Ohio River Valley Water Sanitation Commission--Periodicals."; "Water quality management--Ohio River Watershed--Periodicals."; "Ohio River Valley Water Sanitation Commission."; "1961"; "

Serial. Printed Ephemera Collection has: 13th (1961).

"; ""; "P10665"; "pec"; "Ohio River Valley Water Sanitation Commission--Periodicals.", "Water quality management--Ohio River Watershed--Periodicals."; "14256"; .