Daniel P. Dem Books

Smart Dragons, Foolish Elves

By John Collier, ROBERT SHECKLEY, Anthony Boucher -, Alan Dean Foster, Esther M. Friesner, Avram Davidson, H. L. Gold, Ron Goulart, George Alec Effinger, Robert Silverberg, Marvin Kaye, Mike Resnick, Nina Kiriki Hoffman, Harlan Ellison, Theodore R. Cogswell, Martin H. Greenberg, Roger Zelazny, William Tenn, Esther Friesner, Robert Grace, Harvey Jacobs, Daniel P. Dem

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Do wizards were funny hats? Do dragons have bad breath? Do dwarves have long, silly names without any vowels? Elf-indulgent collections of tales that skew the knight life, mock the magic, and hoot...

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.