Senate executive document, 85th Congress, 2d session. B. Convention with Belgium supplementing convention of Oct. 28, 1948, relating to double taxation, message from President of United States transmitting convention between United States and Belgium, signed Washington. Aug. 22, 1957, supplementing convention of Oct. 28, 1948, for avoidance of double taxation and prevention of fiscal evasion with respect to taxes on income, as modified by supplementary convention of Sept. 9, 1952.