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. 2018 Sep 19;13(9):e0202511. doi: 10.1371/journal.pone.0202511

Table 12. Frequencies of broken chert flakes across Holocene units.

AU Complete Long. Trans. Other broken All broken
1 495 118 458 368 944 (65.6%)
2 64 21 36 40 97 (60.2%)