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In the details of their works, and in manufactured ar. ticles taken from the mounds, there is evidence of con

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siderable civilization.

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Fig. 16.-Rectangular Work, Randolph County, wn. important works of the Mound-Builders, chiefly in Ohio. Relics of art have been dug from some of the mounds, consisting of a considerable variety of ornaments and implements, made of copper, silver, obsidian, porphyry, and greenstone, finely wrought. There are axes, single and double; adzes, chisels, drills or gravers, lance-heads, knives, bracelets, pendants, beads, and the like, made of copper. There are articles of pottery, elegantly designed and finished; ornaments made of silver, bone, mica from the Alleghanies, and shells from the Gulf of Mexico. The articles made of stone show fine workmanship; some of them are elaborately carved. Tools of some

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