Laurie Wallmark Books

Grace Hopper

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The inspiring story of Grace Hopper the boundary-breaking woman who revolutionized computer science told in an engaging picture book biography.

Hedy Lamarr s Double Life

By Laurie Wallmark

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Ada Byron Lovelace and the thinking machine

By Laurie Wallmark

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Offers an illustrated telling of the story of Ada Byron Lovelace, from her early creative fascination with mathematics and science and her devastating bout with measles, to the ground-breaking algo...

Dino Pajama Party

By Michael Robertson, Laurie Wallmark

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Dino Pajama Party

By Michael Robertson, Laurie Wallmark

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Dino Pajama Party

By Michael Robertson, Laurie Wallmark

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Dino Pajama Party

By Michael Robertson, Laurie Wallmark

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Dino Pajama Party

By Michael Robertson, Laurie Wallmark

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Hedy Lamarr s Double Life

By Laurie Wallmark, Katy Wu

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Grace Hopper

By Laurie Wallmark, Katy Wu

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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.