Among the historic village sites which have been studied and surveyed by the State Historical Society of North Dakota, as mentioned in the preceding sketch of the Mandan, was that "of the largest Hidatsa village on Knife river." The map made for the society is here reproduced in figure 12. This, to quote Libby, "shows the present appearance of the ... largest Hidatsa village site, located just north of the mouth of Knife river. From the position and direction of the doorways, it is seen that these villages show no such large grouping as is characteristic of the Mandan village...." It was observed that the circles marking the positions of the earth lodges were much deeper in the Hidatsa villages than in the two Mandan sites. In the former the extreme depth below the "highest part of the rim was often three feet and very commonly over two feet," but on the Mandan sites the depressions were quite shallow. And "in many cases it was observed that in and near the Hidatsa villages were mounds of debris of varying heights, while nothing of the kind was seen on or near Mandan sites." (Libby, (1), p. 500.) Noting these characteristic features of the two groups of villages, or rather of the villages of the two tribes, should reduce the difficulty of identifying other ancient sites in the upper Missouri Valley. The several quotations already made refer to the earth-covered lodges of the Hidatsa, but the same people also made use of the typical skin tipi, although less often mentioned by the early writers. They probably resembled the structures used by the Crow. On November 8, 1833, when Maximilian was returning to Fort Clark from the mouth of the Yellowstone, he wrote: "At twelve o'clock we were opposite the first Manitari summer village, and saw, on the other side, many Indians.... The invitations to land became more vociferous and numerous." Going ashore "we were immediately conducted, by a distinguished man, Ita-Widahki-Hisha (the red shield), to his tent, which stood apart on the prairie, on the summit of the bank. The white leather tent was new, spacious, and handsomely ornamented with tufts of hair of various colours, and at each side of the entrance, finished with a stripe and rosettes of dyed porcupine quills, very neatly executed. It had been well warmed by a good fire, a most refreshing sight to us. We took our seats around it, with the numerous family, the brother and uncle of the chief, young men, women, and children. The chief had rather a long beard, like the Punca chief, Shudegacheh, and his right breast was tattooed with black stripes.... A large dish of boiled maize and beans was immediately set before us; it was very tender and well dressed, and three of us eat out of the dish with spoons made of the horn of buffalo, or bighorn; after which the red Dacota pipe went round." (Maximilian; (1), p. 316.) This must have been a beautiful example of the buffalo-skin tipi, new and white, decorated with quillwork and tufts of hair.