Calo, Marcos Books

The mystery of the mosaic

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In Venice, Italy, second graders Ethan and Ella hope to find a stolen gondola and a hidden mosaic before their parents realize they are missing.

The mystery of the suspicious spices

By Harper Paris

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In a Mumbai market, twin detectives Ethan and Ella investigate why a spice seller's spices have suddenly gone bad.

The mystery of the suspicious spices

By Harper Paris

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In a Mumbai market, twin detectives Ethan and Ella investigate why a spice seller's spices have suddenly gone bad.

The Field Trip Mysteries: The Mount Rushmore Face That Couldn'T See

By Steven Brezenoff, Steve Brezenoff, Brezenoff, Steve, Calo, Marcos, Canga, Chris

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When Catalina "Cat" Duran and her friends in the History Club arrive at Mount Rushmore on a school trip they find that someone is playing dangerous tricks and trying to drive people away from the p...

The Field Trip Mysteries: The Mount Rushmore Face That Couldn'T See

By Steven Brezenoff, Steve Brezenoff, Brezenoff, Steve, Calo, Marcos, Canga, Chris

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Mount Rushmore Face That Couldn'T See

By Steven Brezenoff, Steve Brezenoff, Marcos Calo, Brezenoff, Steve, Calo, Marcos, Canga, Chris

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Cat and her friends visit Mount Rushmore, and things quickly get mysterious.

Field Trip Mysteries

By Steven Brezenoff, Steve Brezenoff, Marcos Calo, Brezenoff, Steve, Calo, Marcos, Canga, Chris

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Cat and her friends visit Mount Rushmore, and things quickly get mysterious.

Mystery of the Mosaic

By Marcos Calo, Harper Paris

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The mystery of the lion s tail

By Harper Paris

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"Twins Ethan and Ella are in the Maasai Mara in Kenya, and there's another mystery to solve. Where are all the lions? Ethan and Ella spot lots of cool animals, but the one they're most excited abou...

The mystery of the lion's tail

By Harper Paris

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

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.