Perry Duis Books

Chicago
Chicago

By Perry Duis

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The Saloon
The Saloon

By Perry Duis

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Challenging Chicago
Challenging Chicago

By Perry Duis

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Risky city. This was Chicago during an unprecedented period of rapid growth: a burgeoning metropolis that quickly became a "concentration of risk." The many thousands of immigrants and rural Americ...

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The Saloon
The Saloon

By Perry Duis

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Chicago
Chicago

By Perry Duis

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Chicago
Chicago

By Perry Duis

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We've got a job to do
We've got a job to do

By Perry Duis

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What is an EAN and How Does it Relate to an ISBN?

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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