Calvert Books

Bigger
Bigger

By Patricia Calvert, Calvert

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When his father disappears near the Mexican border at the end of the Civil War, twelve-year-old Tyler decides to go after him and bring him home, acquiring on the journey a strange dog which he nam...

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Mexican Revolution 1910 1914
Mexican Revolution 1910 1914

By Calvert

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Teacher s Manual
Teacher s Manual

By Calvert

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Listos! 3 Rojo Cassette Pack
Listos! 3 Rojo Cassette Pack

By Calvert

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Listos! 3 Rojo CD Pack
Listos! 3 Rojo CD Pack

By Calvert

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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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