Doug Wilhelm Books

The Gold Medal Secret Choose Your Own Adventure R

By Doug Wilhelm, R. A. Montgomery

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Underground Railroad

By Doug Wilhelm, Ray Montgomery

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Raising the shades

By Doug Wilhelm

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After his mother and sister move out, thirteen-year-old Casey begins to realize that his father's drinking problem is more than he can handle and that the intervention his aunt suggests may be the...

The year is 1938, months before the start of World War II. The Jewish synagogue is on fire and everyone is just watching! Why are Jews being targeted? How will they escape? You must create a secret...

True Shoes

By Doug Wilhelm, Thomas Stephen Jr.

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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.