Donald J. Sobol Books

Encyclopedia Brown Gets His Man

By Donald J. Sobol

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Encyclopedia Brown and the Case of the Secret Pitch

By Donald J. Sobol

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Encyclopedia Brown, Boy Detective

By Donald J. Sobol

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Encyclopedia Brown Finds the Clues

By Donald J. Sobol

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Leroy Brown, aka Encyclopedia Brown, is Idaville neighborhood’s ten-year-old star detective. With an uncanny knack for trivia, he solves mysteries for the neighborhood kids through his own de...

Encyclopedia Brown Gets His Man

By Donald J. Sobol

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Leroy Brown, aka Encyclopedia Brown, is Idaville neighborhood’s ten-year-old star detective. With an uncanny knack for trivia, he solves mysteries for the neighborhood kids through his own de...

Encyclopedia Brown and the Case of the Secret Pitch

By Donald J. Sobol

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A cross-eyed baseball pitch...A missing penknife named Excalibur...Poems that pack a punch...A kid-lover tumed kidnapper...And some tall tales that come up short!These are just some of the ten brai...

Encyclopedia Brown, Boy Detective

By Donald J. Sobol

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A Civil War sword...A watermelon stabbing...Missing roller skates...A trapeze artist's inheritance...And an eyewitness who's legally blind!Theses are just some of the ten brain-twisting mysteries t...

Encyclopedia Brown Midnight Visitor

By Donald J. Sobol

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Encyclopedia Brown Solves Them All

By Donald J. Sobol

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Encyclopedia Brown Saves the Day

By Donald J. Sobol

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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.