Andrew K. Diemer Books

Vigilance
Vigilance

By Andrew K. Diemer

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Vigilance
Vigilance

By Andrew K. Diemer

Average: 0.00, 0 Ratings

The remarkable and inspiring story of William Still, an unknown abolitionist who dedicated his life to managing a critical section of the Underground Railroad in Philadelphia—the free state d...

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Vigilance
Vigilance

By Andrew K. Diemer

Average: 0.00, 0 Ratings

The remarkable and inspiring story of William Still, an unknown abolitionist who dedicated his life to managing a critical section of the Underground Railroad in Philadelphia—the free state d...

Read More
Vigilance
Vigilance

By Andrew K. Diemer

Average: 0.00, 0 Ratings

Read More
Vigilance
Vigilance

By Andrew K. Diemer

Average: 0.00, 0 Ratings

The remarkable and inspiring story of William Still, an unknown abolitionist who dedicated his life to managing a critical section of the Underground Railroad in Philadelphia—the free state d...

Read More

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If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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