Andy Helfer Books

Shadow Master Series Volume 2

By Kyle Baker, Marshall Rogers, Andy Helfer

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Shadow Master

By Andrew Helfer, Kyle Baker, Howard Chaykin, Joe Orlando

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Deadman Omnibus (2025 Edition)

By Andy Helfer

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The adventures of one of DC's most distinctive heroes, Deadman, are collected in a decades-spanning hardcover edition.Originally introduced in 1967, Deadman was a circus performer known as "Boston"...

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.