Roy Wandelmaier Books

Secret of the old museum

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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.

Shipwrecked on Mystery Island

By Roy Wandelmaier

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You are shipwrecked on a beautiful Pacific island in 1869 and must choose a course of events that will get you off, keep you there, or, indeed, ensure that you survive at all.

Shipwrecked on Mystery Island

By Roy Wandelmaier

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You are shipwrecked on a beautiful Pacific island in 1869 and must choose a course of events that will get you off, keep you there, or, indeed, ensure that you survive at all.

Las nubes

By Roy Wandelmaier

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Brief text and illustrations explain the characteristics of different kinds of clouds.

Las estrellas

By Roy Wandelmaier

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Describes some of the characteristics of stars, those hot glowing inhabitants of space, of which our sun is but one.

Acerca De Las Estrellas Ahora Se

By Irene Trivas, Roy Wandelmaier

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Clouds

By Roy Wandelmaier

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Brief text and illustrations explain the characteristics of different kinds of clouds.

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.