978156234436

• 9 — Number system
• 78156 — Manufacturer code
• 23443 — Product code
• 6 — Check digit (confirms the number is well-formed)

UPC-A ✓ Valid check digit

• 9781562349479 — Mailbox book book choose&do math grid gr2-3 tec61228
• 9781562348274 — Mailbox book book daily journal promps k-1 tec61114
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• 9781562348403 — Mailbox book book indp practice l.a. gr-2 tec61149
• 9781562348298 — Mailbox book book let's do science tday k-1 tec61165

Mailbox book book superbook of ideas gr-3 tec61050

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