Peter Roop Books

The top secret adventure of John Darragh Revolutionary War spy
The top secret adventure of John Darragh Revolutionary War spy

By Amanda Doering Tourville, Peter Roop

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From 1777 Philadelphia, fourteen-year-old Quaker John Darragh carries a secret message, in a code created by his mother, to his older brother Charles, who is a member of George Washington's army.

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Sacagawea
Sacagawea

By Peter Roop, Connie Roop

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Going Buggy
Going Buggy

By Peter Roop, Connie Roop

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Out to Lunch
Out to Lunch

By Peter Roop, Joan Hanson, Connie Roop

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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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