Marcos Calo Books

Doom At Grant s Tomb

By Marcia Wells, Marcos Calo

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The bowling lane without any strikes

By Steven Brezenoff

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Catalina "Cat" Duran and her sixth-grade class are on a bowling trip, but in one lane the ball keeps going mysteriously off track, so the four friends decide to investigate the problem.

The Dinosaur that Disappeared

By Steve Brezenoff

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The bowling lane without any strikes

By Steven Brezenoff

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Catalina "Cat" Duran and her sixth-grade class are on a bowling trip, but in one lane the ball keeps going mysteriously off track, so the four friends decide to investigate the problem.

Second graders Ethan and Ella are sad about moving away from their hometown to travel the world with their mom, a journalist, and dad, who will home school them, but before they go they have a myst...

The mystery of the gold coin

By Harper Paris

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The mystery of the mosaic

By Harper Paris

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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 secret society

By Harper Paris

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"Twins Ethan and Ella go on an adventure in Greece, where they learn about the mystery-solving Society of Apollo"--

The mystery of the secret society

By Harper Paris

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"Twins Ethan and Ella go on an adventure in Greece, where they learn about the mystery-solving Society of Apollo"--

Greetings from Somewhere 4 Books in 1

By Marcos Calo, 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.