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Cathlacomatup Indians. A Chinookan tribe residing in 1806, according to Lewis and Clark 1Lewis and Clark, Expeditions, II, 226, 1814, on the south side of Sauvies Island, in the present Multnomah County, Oregon, on a slough of Willamette River. Their estimated number was 170.

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1.Lewis and Clark, Expeditions, II, 226, 1814