Keith Herber Books

The Keeper s Companion Blasphemous Knowledge Forbidden Secrets

By William Deitze, Keith Herber

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Mansions of Madness Call of Cthulhu Horror Roleplaying 1920s Era

By Michael DeWolfe, Wesley Martin, Mark Morrison

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Call of Cthulhu Investigators Handbook

By Mike Mason, Lynn Willis, Paul Fricker, Sandy Petersen

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Call of Cthulhu Starter Set

By Mike Mason, Chaosium Inc, Lynn Willis, Gavin Inglis, Dan Kramner, John Sullivan, Paul Fricker, Chris Spivey, Mark Morrison, Sandy Petersen, Keith Herber

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Investigator s Companion for the 1920s

By Keith Herber

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En 1851, un marin un peu escroc est choisi par la Famille pour devenir un vampire, un buveur de sang immortel. De nos jours, dans un San Francisco envahi par les gangs, les clochards, les punks, il...

The Fungi from Yuggoth

By Chris Marrinan, Keith Herber

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Prince of the City

By Keith Herber

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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.