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[[image]] B.S. 22172. Mud flats exposed at low tide at mouth of Río Ajó. Lavalle, Buenos Aires, Argentina. November 15, 1920. [[image]] 1424. Mouth of Río Ajó, below Lavalle, Buenos Aires, Argentina. November 15, 1920. [[image]] B.S. 22173. Alkaline flats at mouth of Río Ajó. Lavalle, Buenos Aires, Argentina. November 15, 1920.