Mary Maruca Books

Joy at Mount Rushmore
Joy at Mount Rushmore

By Mary Maruca

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A kid's guide to exploring San Antonio Missions National Historical Park
A kid's guide to exploring San Antonio Missions National Historical Park

By Mary Maruca

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An overview of the San Antonio Mission, its buildings, and the people who inhabited it, including Franciscan friars, Coahuiltecan Indians, Apache Indians, and Spanish soldiers.

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A kid's guide to exploring Saguaro National Park
A kid's guide to exploring Saguaro National Park

By Mary Maruca

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An overview of Saguaro National Park, examining its Sonoran Desert and its plants and animals.

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A kid's guide to exploring Montezuma Castle National Monument
A Kid s Guide to Exploring Walnut Canyon National Monument
Brown v. Board of Education National Historic Site
Exploring White Sands National Monument
Exploring national parks
Exploring national parks

By Mary Maruca, David Grant Noble

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Discusses America's national parks, their history, geography, and plant and animal life.

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A Kid s Guide to Exploring Great Sand Dunes National Monument and Preserve
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By Mary Maruca

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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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