Donald J. Sobol Books

The ten-year-old detective continues his war on crime in Idaville through ten more cases, for which the reader is invited to guess the solution before it is revealed.

Encyclopedia Brown, Super Sleuth

By Donald J. Sobol

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Encyclopedia Brown, Super Sleuth

By Donald J. Sobol

Average: 0.00, 0 Ratings

With a knack for trivia, Encyclopedia solves mysteries for the neighborhood kids through his own detective agency. But his dad is also the chief of police, and every night Encyclopedia helps him so...

Encyclopedia Brown Finds the Clues

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.