Mary Lou Clark Books

Mark McGwire
Mark McGwire

By Stewart Mark

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Presents a biography of the St. Louis Cardinal slugger who broke Roger Maris' single-season home run record in 1998.

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Dinosaurios
Dinosaurios

By Mary Lou Clark

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Briefly describes a number of different dinosaurs, what came before and after them, why they disappeared, and how we have learned about them.

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Dinosaurs
Dinosaurs

By Mary Lou Clark

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Dinosaurios Spanish New True Books
The Junior true book of dinosaurs
Dancer
Dancer

By Mary Lou Clark, Clement Crisp

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Dinosaurios
Dinosaurios

By Mary Lou Clark

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Dinosaurs
Dinosaurs

By Mary Lou Clark

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Briefly describes a number of different dinosaurs, what came before and after them, why they disappeared, and how we have learned about them.

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If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

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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