American Antiquarian, 1891
THE DAKOTAS AND THEIR TRADITIONS.
Editor American Antiquarian
The Iowas and Ponka Sioux had a tradition of building large burial mounds like Seip in Ross County, Ohio
According to Dakota traditions, the Iowas and Ponkas built much larger mounds than the Dakotas. I have myself heard several Dakotas say that the Iowas (" Syakhibee" in the Santee dialect) built the round mound thirty feet high, perhaps partly natural, on the brow of the bluff a mile east of my father's mission station, and quite an extensive