United States. Department of the Treasury. "U.S.A./Nigeria Income Tax Treaty To Be Terminated, August 23, 1978," in United States. Department of the Treasury. "Volume 216," Press Releases of the United States Department of the Treasury (August 1, 1978 - September 15, 1978) : 349-350. https://fraser.stlouisfed.org/title/6111/item/587059/toc/530232 , accessed on May 29, 2023.
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