Heimann Rolf Books

Amazing Mazes

By Heimann Rolf, Rolf Heimann

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Picture Puzzle Mysteries: Whodunits You Can See

By Heimann Rolf, Rolf Heimann

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79 pages : 26 cm Every picture tells a story ... and these pictures hold the key to mysteries that will baffle you. Read the story, look at the picture and try to solve the puzzle Includes index

Awesome Alphamaze

By Heimann Rolf, Rolf Heimann

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Commander Xora wore a grave expression as she entered the meeting of the Ixenstein Intergalactory Exploration Society, in the company of the latest robot Alphalpho.

Picture Puzzle Mysteries: Whodunits You Can See

By Heimann Rolf, Rolf Heimann

Average: 0.00, 0 Ratings

79 pages : 26 cm Every picture tells a story ... and these pictures hold the key to mysteries that will baffle you. Read the story, look at the picture and try to solve the puzzle Includes index

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.