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When one considers how exhaustive an effort was involved in the[ir] construction … and how profoundly their presence … influenced the economic, military, and political development of the communities whose boundaries they formed, one can realize how important it is … to determine the period of their construction and use.…”
When one considers how exhaustive an effort was involved in the[ir] construction … and how profoundly their presence … influenced the economic, military, and political development of the communities whose boundaries they formed, one can realize how important it is … to determine the period of their construction and use.…”