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Introduction The Loess Highland of north-central China occupies an agro-pastoral ecotone between the agricultural heartland of the early states and the pastoral steppe regions further north. As a region of scarce resources and harsh natural environment, it has traditionally been regarded as a cultural periphery.
Conflicts of Interest The authors declare no conflicts of interest. Data Availability Statement The data that supports the findings of this study are available in the of this article. Supporting Information Filename Description oa70049-sup-0001-Table_S1-3.xlsxExcel 2007 spreadsheet , 65.2 KB Table S1: Quantities, species, and modification types of cowries unearthed from the Yaojia, Kongtougou, and Zhougongmiao sites.
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