August Derleth Books

The Watchers Out of Time

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Venture at your own risk into a realm where the sun sinks into oblivion–and all that is unholy, unearthly, and unspeakable rises. These rare, hard-to-find collaborations of cosmic terror are back i...

The Watchers Out of Time

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Father Marquette and the Great Rivers

By August Derleth

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Saint Ignatius and the Company of Jesus

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Regarding Sherlock Holmes

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Chronicles of Solar Pons

By August Derleth

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Memoirs of Solar Pons

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Reminiscences of Solar Pons

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Return of Solar Pons

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Mr. Fairlie s Final Journey

By August Derleth

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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.