Donald J. Sobol Books

An unexpected midnight quest...A holdup at the First City Bank...A stolen tennis racket...Gerbils who paint in pairs...and fifty mosquitoes netted at the Oddball Olympics!These are just some of the...

Encyclopedia Brown Solves Them All

By Donald J. Sobol

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Leroy Brown is back in the next six books in the Encyclopedia Brown series. As Idaville’s ten-year-old star detective, Encyclopedia has an uncanny knack for trivia. With his unconventional kn...

Encyclopedia Brown Saves the Day

By Donald J. Sobol

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A camper who's been bound and gagged...A stolen bike wheel...Two kidnapped pigs...A boy with wings...And a foot-warmer inventor who accidentally puts his own foot right in his mouth!These are just...

Encyclopedia Brown Keeps the Peace

By Donald J. Sobol

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Encyclopedia Brown has an uncanny knack for trivia. With his unconventional knowledge, he solves mysteries for the neighborhood kids through his own detective agency. But his dad also happens to be...

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.