Laurie Calkhoven Books

You Can t Bring a Sandwich to the Moon . . . and Other Stories about Space

By Laurie Calkhoven

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Lin Manuel Miranda

By Laurie Calkhoven

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Mount Rushmore s hidden room and other monumental secrets

By Laurie Calkhoven

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Did you know that President Franklin Roosevelt had a secret train station in New York City? Or that there s a hidden room inside Mount Rushmore? Unearth secrets about these monuments and more in th...

Miles of Smiles

By Laurie Calkhoven

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Innerstar University 4 Story Set includes A Winning Goal American Girl Quality

By Laurie Calkhoven

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Project friendship

By Laurie Calkhoven

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"You can't wait for the science fair. You have so many fun ideas! But working with friends sure gets complicated. One partner disagrees with your ideas. Another leans on you a little too much. Can...

The traveler s tricks

By Laurie Calkhoven

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On a three-day stagecoach ride to the big city of Albany during the War of 1812, eleven-year-old Caroline is fascinated by the other travelers, including a charming magician and a beautiful young w...

Boys of Wartime: Daniel at the Siege of Boston, 1776

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Twelve-year-old Daniel cheered when American colonists dumped English tea into Boston Harbor to protest taxes. But King George sends soldiers to punish the rebellious colonists, and friends turn on...

Will at the Battle of Gettysburg 1863

By Laurie Calkhoven

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Martin Luther King Jr

By DK Publishing, Laurie Calkhoven

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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.