flexbooks.ck12.org
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2600:9000:2156:2200:8:f05f:c540:93a1
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Submitted URL: http://flexbooks.ck12.org/
Effective URL: https://flexbooks.ck12.org/flexbooks/
Submission: On February 16 via api from US — Scanned from DE
Effective URL: https://flexbooks.ck12.org/flexbooks/
Submission: On February 16 via api from US — Scanned from DE