Roy Wandelmaier Books

While vacationing in Scotland, the reader becomes involved in searching for a missing professor who has been investigating the Loch Ness monster and is provided with some fantastic choices to make.

Mystery at Loch Ness

By Roy Wandelmaier

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While vacationing in Scotland, the reader becomes involved in searching for a missing professor who has been investigating the Loch Ness monster and is provided with some fantastic choices to make.

Secret of the old museum

By Roy Wandelmaier

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The reader's decisions control a series of adventures inside a museum, including time travel to ancient Egypt and an encounter with aliens from the Alpha Centauri system.

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.