Donald Lemke Books

El Joker, el enemigo por excelencia del Cruzado enmascarado, ha conseguido escaper del Asilo Arkham. Batman lo persigue hasta un almacén abandonado donde el payaso ha establecido su centro de opera...

Superman Versus The Silver Banshee

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Batman

By Donald B. Lemke

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When a man posing as Bruce Wayne causes problems at the bank, Batman knows exactly who the impostor is. But it's hard to catch a criminal who can change shape.

Battle in the batcave

By Donald B. Lemke

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Bane finds a way into the Batcave and takes control of Batman's weapons.

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.