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Original Message:   Early blue glass beads in Illinois vs those beads found in northern Alaska
I haven't waded through this article, just skimmed it, but was intrigued by the radiocarbon date chart and the pictures of the beads.

"Four dates from four features are associated with the protohistoric component and these have corrected one-sigma spans that range from AD 1490 to AD 1663 (Table 1), providing the likely time frame for the glass bead assemblage."

https://www.academia.edu/22984663/Seventeenth_Century_Glass_Beads_from_the_New_Lenox_Site_in_Will_County_Illinois

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