August William Derleth Books

Father Marquette and the Great Rivers

By H. Lawrence Hoffman, August Derleth, August William Derleth

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A biography of the French Catholic priest who arrived in Canada in 1666 to serve as a missionary, and became part of the first group of white men to travel down the Mississippi River and back.

Chronicles of Solar Pons

By August William Derleth

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Watchers Out of Time and Others

By H. P. Lovecraft, August William 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.