Donald Lemke Books

This book is all about the incredible people who push themselves to their physical limits. Whether it's swallowing the most swords, pulling a 200-ton plane, or balancing on four fingers for the lon...

Fun House of Evil

By Erik Doescher, Mike DeCarlo, David Tanguay, Donald Lemke

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Superman

By Donald Lemke

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When Bizarro starts terrorizing Metropolis, it s up to Superman to set the backwards villain straight. With a little help from Supergirl, this super team will keep Bizarro from having the last laugh.

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.