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B.S. 21989. Bordering fringe of saw grass on an estero. Las Palmas, Chaco, Argentina. July 30, 1920.

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B.S. 21990. Vegetation in an estero. Las Palmas, Chaco, Argentina. July 30, 1920.

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B.S. 21991. A termite hill, opened by flickers. Las Palmas, Chaco, Argentina. July 30, 1920.