Donald A. Wollheim Books

The Universe Makers

By Donald A. Wollheim

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Science Fiction Today

Trilogy of the Future

By Clifford D. Simak

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Science Fiction Special: No. 9

By Groff Conklin

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The Universe Makers

By Donald A. Wollheim

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Tales of the Lovecraft Mythos

By Robert M. Price

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When H. P. Lovecraft first introduced his macabre universe in the pages of Weird Tales magazine, the response was electrifying. Gifted writers—among them his closest peers—added sinister new elemen...

The Best from the rest of the world

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Ghosts

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Mike Mars South Pole Spaceman mike Mars 6

By Donald A. Wollheim

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Mike Mars Astronaut Mike Mars 1

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The Secret of the 9th Planet

By Donald A. Wollheim

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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.